Webex Training is not supporting CMR which allows the usage of Endpoints in Meetings/Events.

I´ts not possible to enable the Webengine to run Webapps on the DX80, that is basically a hardware limited (not enough power) for a Device released in 2014. I can remember the browsing performance of the DX80 running Android back in the days I guess ...

You can enable it in Meetings Site Settings: 

The Permissions you checked already?https://help.webex.com/en-US/article/73zvl3/Support-for-Cisco-Webex-Meetings-for-macOS-Catalina

Yes, got my ones today too.