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This article applies to Mac users running macOS 10.14 or higher with TeamViewer or Blizz.

Background

Apple has introduced a security mechanism with macOS 10.14 (Mojave), which requires special access to be granted to remote control applications like TeamViewer.

And macOS 10.15 (Catalina) has strengthened the security and privacy even further, and requires additional permissions to be given to TeamViewer in order to control your Mac.

Without this access, TeamViewer users connecting to macOS 10.14 or higher will only be able to view the screen but not control it with their mouse or keyboard.

And TeamViewer users connecting to macOS 10.15 or higher will additionally only be able to view the desktop background and the TeamViewer app, but not any other applications at all.

This additional permissions must be granted locally on the Mac and require admin rights. The process differs between Mojave and Catalina.

Please find the different how-to guides for the setup on Mojave and Catalina below.

Note: TeamViewer is not able to grant this access by itself, nor can the access be granted remotely through a TeamViewer connection from another computer.

How-to guide for macOS Mojave

How to grant access to TeamViewer on your Mac

  1. If you're using the latest release of TeamViewer 14 on your Mac running macOS 10.14 (Mojave), you will be presented with this dialog when you start TeamViewer:
    ReviewSystemAccessMojave.png

    Note: if you're using an older version of TeamViewer, you won't see the dialog above. Instead, macOS will prompt you with the dialog below when the first incoming connection is made to your Mac.

  2. In the dialog shown above, click the Request Access button, which will bring you to this Accessibility Access (Events) dialog:
    Accessibility Access Dialog - TeamViewer.png
  3. Click the button Open System Preferences. You will be taken to the Accessibility section of the Privacy pane, inside the Security & Privacy preferences.

  4. Click the lock icon in the lower-left corner to make changes. You will be prompted to enter the credentials of an administrator account to continue.

  5. Put a check next to TeamViewer to grant it access:
    Security & Privacy 1.png
  6. Now you can close the Security & Privacy window. The next time you want to receive an incoming connection with TeamViewer, the person connecting to your Mac will now be able to control it with their mouse and keyboard.

How to grant access when you aren’t presented with the dialog

If you're using an older version of TeamViewer, and you're not presented with the Accessibility Access dialog asking you to grant access to TeamViewer – or if you had previously clicked the Deny button on that dialog – it’s still possible to grant access to TeamViewer.

Additionally, in some cases, you can grant access to TeamViewer immediately after installing TeamViewer onto your Mac, before the first TeamViewer connection is made to your computer. Note that this is not possible with TeamViewer Host.

Here’s how:

  1. Go to System Preferences, then Security & Privacy, then Privacy, then Accessibility.

  2. Click the lock icon to make changes.

  3. If TeamViewer is already shown in the pane, then put a check next to it to enable it.

  4. If not, click the small button with the plus symbol underneath the pane. This opens a Finder window:
    Security & Privacy 3.png
  5. Navigate to your Applications folder, select TeamViewer, and click Open.

  6. Now you should have TeamViewer listed in the pane and enabled.

How to grant access when starting TeamViewer with System

If you enable the setting Start TeamViewer with System, which is found in TeamViewer’s Preferences, then TeamViewer will restart using a different process called TeamViewer_Desktop.

This is also the case when using TeamViewer Host.

The first time a connection is made to your Mac after doing this, you will be presented with the Accessibility Access dialog once more, but this time referring to the new process. You will need to grant access once again by clicking the button “Open System Preferences” and following the same steps outlined above.Security & Privacy 2.png

Unfortunately, it is not possible to grant access to the TeamViewer_Desktop process manually. You will need to wait until the first incoming connection is made to your Mac before you can add this process.

How-to guide for macOS Catalina

How to grant access to TeamViewer on your Mac

If you're starting TeamViewer 14.7 on your Mac running macOS 10.15 (Catalina) for the first time, you will be prompted with the following dialog:

Screen Shot 2019-10-08 at 3.27.59 PM.png

You can also open this dialog by clicking on Help --> Check system access.

By default, all permissions are set to Denied. Please give permission to the system capabilities manually to use TeamViewer as desired. If you or others need to access the Mac remotely, Screen Recording and Accessibility are required at a minimum.

Screen Recording

Accessibility

Full Disk Access

TeamViewer requires Screen Recording access so remote users can see your screen in Remote Control Sessions and Meetings TeamViewer requires Accessibility access so your mouse and keyboard can be controlled remotely.

TeamViewer requires Full Disk Access to access files and folders on your Mac for File Transfer (sending and receiving files in general).

 

To allow the access, click the buttons shown in the dialog. Eg. click Open Full Disk Access Preferences... which will bring you to the Full Disk Access section of the Privacy pane, inside the Security & Privacy preferences:

Catalina Full Disk Access.pngFor the Accessibility access you will need to click the padlock icon in the lower-left corner to make changes. You will be prompted to enter the credentials of an administrator account to continue.

Put a check next to TeamViewer to grant it access:

Catalina_TeamViewer_enabled.png

Repeat the same for Screen Recording and Accessibility if desired. Those are required to control your Mac.

Click again on the padlock in the lower-left corner to prevent further changes.

Now you can close the Security & Privacy window. The next time you want to receive an incoming connection with TeamViewer, the person connecting to your Mac will be able to see and control your screen.

The permission status can be reviewed under Help -> Check system access at any time.

Screen Shot 2019-10-08 at 3.58.40 PM.png

The yellow triangle icon in the upper-left area of the TeamViewer window is shown until you have allowed the system access for TeamViewer:Catalina_on_Tensor.png

Note: if you're using an older version of TeamViewer, you won't see the triangle icon above. Instead, the Mac will display a system dialog informing you that TeamViewer wants to access additional resources. The settings must be changed on the remote side.

 

How to grant access when you aren’t presented with the dialog

If you're using an older version of TeamViewer, and you're not presented with the Review System Access dialog asking you to grant access to TeamViewer – or if you had previously clicked the Deny button on that dialog – it’s still possible to grant access to TeamViewer.

Additionally, in some cases, you can grant access to TeamViewer immediately after installing TeamViewer onto your Mac, before the first TeamViewer connection is made to your computer. Note that this is not possible with TeamViewer Host.

Here’s how:

  1. Go to System Preferences, then Security & Privacy, then Privacy, then Screen Recording, Full Disk Access, and Accessibility.

  2. Only for Accessibility: Click the lock icon to make changes.

  3. If TeamViewer is already shown in the pane, then put a check next to it to enable it.

  4. If not, click the small button with the plus symbol underneath the pane. This opens a Finder window:
    Security & Privacy 3.png
  5. Navigate to your Applications folder, select TeamViewer, and click Open.

  6. Now you should have TeamViewer listed in the pane and enabled.

How to grant access when starting TeamViewer with System

If you enable the setting Start TeamViewer with System, which is found in TeamViewer’s Preferences, then TeamViewer will restart using a different process called TeamViewer_Desktop (only for Accessibility).

This is also the case when using TeamViewer Host.

The first time a connection is made to your Mac after doing this, you will be presented with the Review System Access dialog once more, but this time referring to the new process. You will need to grant access once again by clicking the button “Open System Preferences” and following the same steps outlined above.Security & Privacy 2.png

Unfortunately, it is not possible to grant access to the TeamViewer_Desktop process manually. You will need to wait until the first incoming connection is made to your Mac before you can add this process.

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