The Magic Mirror needs to connect to your Discord or Twitter to collect your email address to match it to your Yat account (if you have one). If you don’t have an email address associated with your Twitter or Discord account, this could be the issue.
Add an email address to the respective account, and try to reconnect to the Magic Mirror. This should resolve the issue.
If you are still having issues after trying the above please contact us at support at firstname.lastname@example.org