Can't connect with Teamviewer API from browser in linux

We use Ninjarmm and when connecting to a remote machine through the browser using the Teamviewer API links I just get this in the Teamviewer log:

2020/08/21 09:27:03.904 55860 **Please do not post TeamViewer IDs**15424 GX1 ShowOtherInstance: triggered existing instance.
Quitting...

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Linux

Issue

TeamViewer 15

yeah, and no reply from Teamviewer...
I've seen 2 or 3 linux version updates and still no fix

Same problem from SyncroMSP.