user unable to upload files in teams

I have a user who, after changing their SAM account name locally in a hybrid environment, can no longer upload files in teams chats. The error he receives is simply "something went wrong while sharing. Let's try again". The user was able to log into their onedrive and can chat normally in teams. They logged into the teams web application and they get the same error there. I'm guessing this is a permission issue of some kind but I can't find any real info on this issue. I ran the self-diagnostic tool in the admin center and it claimed there were no found issues with the user account.