If you haven't tried this already, I suggest you try signing out of your data file completely and then signing back in. This process will refresh your registration token. However, before you take the steps outlined below, first Backup your Quicken datafile, just in case.
Here are the steps you'll need to take
1) Go to "Edit" > "Preferences";
2) At the bottom of the list - Select "Quicken ID & Cloud accounts";
3) Click on "Sign in as a different user" them follow the prompts to "Sign Out"
4) Then sign back in by using your Quicken ID (which is your email address) and then enter your password.
Let me know how that goes.
Frankx