I have the same problem and test everything.
Deinstall Adobe Acrobat DC, install again. Tried the Creative Cloud Cleaner, but Adobe Acrobat is not part of the cleaning possibility.
I am really irritated why there is no solution since several years.
It's truly unbelievable that Adobe has failed to fix this problem, which has existed for years.
We pay money every month for the applications and the service leaves so much to be desired.
Incidentally, it only affects PCs that have the Intel graphics unit integrated into the CPU and also have a
dedicated graphics card. This is the case with my Alienware notebook with RTX3080.
The solution is as follows: In the Windows graphics settings, the “app” Acrobat must be manually added and then
set so that only the Intel graphics unit can be used.
Then it also works with the integration of videos in all PDFs.
Thanks Adobe - it only took me a day's work to solve the problem and not with the help of Adobe,
but with the help of the community.
So thank you Adobe, for nothing!