How to fix "Cannot Open, This Content Not Authorized" error on iTunes

I have an extensive ITunes music collection- music that I have purchased over the span of 10+ years. When I upgraded my phone to the 15pro max, I did the Apple Music free trial. Once the trial was complete, I cancelled (and had to re-download my entire catalog)

Since re-adding my music, 3/4 of it will not play more than a few seconds before I get the “cannot open, this content not authorized” error. I’ve tried the troubleshooting and still cannot get music to play in its entirety and it’s extremely frustrating. So much $$ invested and I cannot hear music I’ve bought and paid for. Anyone else still have issues after troubleshooting?

[Re-Titled by Moderator]