Additional meeting and call-related features and issues within Microsoft Teams for Education
Yes, restarted the computer several times, with and without Teams being started f=after login. The Elgato doesn't have a power on/of optione, it's an USB-device. Unplugging, wait 30 seconds and plug back in doesn't solve the issue.
I've removed the Teams cache folders (%APPDATA%\Microsoft\Teams) after quiting Teams (full quit, so not active in the system tray or background), restarted the computer, logged in, restarted Teams, logged in with 365. Still no improvements. Removed the Teams app completely, including the cache folders, restarted the computer, logged, in, reinstalled the Teams app from the latest downloadable version, logged in with 365, updated the Teams app, restarted the computer, started the Teams add, inserted the Elgato Stream Deck +, got a new API key and entered this in the Stream Deck application. No improvements.
Also removed the Stream Deck application and repeated all steps above. Reinstalled the latest Stream Deck application, still no improvements.