Teamviewer keeps asking for password for workstations that have been previously added to my account.

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Hi there.

Teamviewer keeps asking for password of remote workstations, that have been previously added to my account. I added them each on location, and have not set any passwords (other then my Teamviewer account password), nevertheless, Teamviewer keeps asking for a password when I try to access them remotely. I have no clue what these extra passwords are.

Every time I have to ask someone on the other end to confirm my connection request, which is very annoying. How can I avoid typing in extra passwords for workstations, that have been previously added to my account?