RDS 2019 Team Webcam redirection not working, blank webcam screen, camera could not be used

Question

Hi Folks,
we have following setup:
AD W2019 Server
RDS W2019 Server
Windows 10 Clients

If we want to use Teams and camera redirection in RDS 2019, the camera is sometimes functional, i guess just for only about 10%.
If you start a video call, Teams tells us "Camera could not be used".

What we have tried so far:
-Windows Updates and Teams Update in RDS Session
-Procmon to show if we get some errors -> yes, here is the log:
15:27:03,0907190 Teams.exe 14132 RegQueryKey HKCR\Interface{26656EAA-54EB-4E6F-8F85-4F0EF901A406} SUCCESS Query: HandleTags, HandleTags: 0x0
15:27:03,0907831 Teams.exe 14132 RegOpenKey HKU\S-1-5-21-2204843668-736489453-274730417-1105_Classes\Interface{26656EAA-54EB-4E6F-8F85-4F0EF901A406}\ProxyStubClsid32 NAME NOT FOUND Desired Access: Read
15:27:03,0908432 Teams.exe 14132 RegQueryKey HKCR\Interface{26656EAA-54EB-4E6F-8F85-4F0EF901A406} SUCCESS Query: HandleTags, HandleTags: 0x0
15:27:03,0908875 Teams.exe 14132 RegOpenKey HKCR\Interface{26656EAA-54EB-4E6F-8F85-4F0EF901A406}\ProxyStubClsid32 SUCCESS Desired Access: Read
15:27:03,0908990 Teams.exe 14132 CreateFileMapping C:\Windows\System32\MMDevAPI.dll FILE LOCKED WITH ONLY READERS SyncType: SyncTypeCreateSection, PageProtection: PAGE_EXECUTE|PAGE_NOCACHE
15:27:03,0909612 Teams.exe 14132 RegQueryKey HKCR\Interface{26656EAA-54EB-4E6F-8F85-4F0EF901A406}\ProxyStubClsid32 SUCCESS Query: Name
15:27:03,0909917 Teams.exe 14132 RegOpenKey HKLM\System\CurrentControlSet\Control\CI REPARSE Desired Access: Read
15:27:03,0910118 Teams.exe 14132 RegQueryKey HKCR\Interface{26656EAA-54EB-4E6F-8F85-4F0EF901A406}\ProxyStubClsid32 SUCCESS Query: HandleTags, HandleTags: 0x0
15:27:03,0910444 Teams.exe 14132 CreateFile C:\Users\m.armann\AppData\Local\Microsoft\Teams\current\resources\app.asar.unpacked\node_modules\slimcore\bin\RASAPI32.dll NAME NOT FOUND Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a
15:27:03,0910846 Teams.exe 14132 RegOpenKey HKLM\System\CurrentControlSet\Control\CI SUCCESS Desired Access: Read
15:27:03,0911864 Teams.exe 14132 RegQueryValue HKLM\System\CurrentControlSet\Control\CI\Disable26178932 NAME NOT FOUND Length: 20
15:27:03,0911888 Teams.exe 14132 RegOpenKey HKU\S-1-5-21-2204843668-736489453-274730417-1105_Classes\Interface{26656EAA-54EB-4E6F-8F85-4F0EF901A406}\ProxyStubClsid32 NAME NOT FOUND Desired Access: Maximum Allowed

I hope somebody have had the same issue and any kind of clue :]!
Best Regards
Markus