Cannot get the teamviewer device assignment to work after install on the full version.

I am trying to set up an unattended install on macOS BigSur. I am using the following command:

sudo /Applications/TeamViewer.app/Contents/Helpers/TeamViewer_Assignment -api-token xxxxxxxx-zzzzzzzzzzzzzzzzzzzz

• I have the full version of TeamViewer installed.
• It is running.
• I have Start TeamViewer with system selected.
• I have the correct API key
• TeamViewer and the assignment tool are both in the appropriate locations

I run the command and enter my password. A few seconds goes by and I am back at the Terminal command prompt. I open preferences and there is no account assignment yet.

I am deploying to at least 700 machines to start and if we have to manually assign each of them it is going to be a heavy lift for a small IT team. Hoping I can get some assistance with this issue. Thanks in advance!