This happens to me with Directv Streaming frequently. For me, the issue starts with not being able to access channels due to authentication errors, I try to update the password for Directv Streaming with no change, I then delete the Directv streaming TVE entry and when I try to add it back in I get the authentication 401 error for an hour or so. Then, without changing anything, it will finally start working properly and will allow me to add Directv Streaming back to TVE. I started seeing this behavior a few months ago. Since it always eventually starts working, I haven't given it a lot of thought.
EDIT - I should of let it finish the operation of adding Directv Stream back in before I posted, the logs are littered with entries like "Channel scan 44/190 FNC failed: Cable provider authentication failed" for channels that I should get. This is on the channels server software ver 2023.08.24.0602.
Chief