Assignment failed

Hello,

I'm new to TeamViewer and trying to deploy the MSI out to all our workstations (Win 10 1709). Everything is going well, except I'm getting a handfull (13 of 36) of desktops in a lab setting that won't activate even though they are identical with the same IP range, VLAN, GPOs, firewall policies, etc.

I have TeamViewer_Assignment.exe (with options) running as a startup script, outputing to a log file. Following is the command:

c:\Config\Utilities\TeamViewer_Host_Assignment\TeamViewer_Assignment.exe -apitoken ######### -datafile "C:\Program Files (x86)\TeamViewer\AssignmentData.json" > c:\config\logs\TeamViewer.log

The results of that log file are:

TeamViewer_Assignment (r350) => Assignment failed with
Get https://webapi.teamviewer.com/api/v1/devices?remotecontrol_id=#######: x509: certificate signed by unknown authority

There is no proxy, it is direct connect. However, the firewall connects by user authentication. Therefore, I created a firewall rull to allow all outbound connections out on port 5398.

Again, identical configuration for all computers. TeamViewer is installing, but is not activating. 

Thanks.