@fagould4525: If that webpage is showing that widevine is properly loaded, then your remaining issues cannot be due to widevine anymore. Sorry, I cannot help you further because I don't have netflix.
You could try and have a look at the netflix references in this link if you haven't found this before. Those comments are pretty recent...
Pinned Comments
mogwai commented on 2021-03-19 15:03 (UTC)
Please make sure to run the registering scripts
register_widevine_firefox
and/orregister_widevine_chromium
for every user that needs to be able to use widevine. This script only needs to be run once; no need to repeat it after upgrade.