Suddenly today many tasks that we use daily are erroring out with the message:
Access denied. You do not have permission to perform this action or access this resource.
This is using CSOM on .NETCore 3.1.
Some examples of the tasks that aren't working are changing the title of a site, getting alerts from a user on a site, creating a subsite, and I'm guessing there are more.
I tried the same exact tasks with the same user using CSOM on .Net Framework 4.7 with no issues, so it seems like its only an issue with .NETCore. I have only tried on 3.1 though.