Issue Description Universal ID is working on some instances but not others. The user gets the login invite but then when they try to sign in, they end up back in another instance without access to the new instance.
Issue Resolution All Marketo subscriptions have Universal ID enabled, so this issue may be a difference in password restrictions. If an instance has different password security requirements than the other instances and the password doesn't meet those restrictions, you can end up in this situation.
Verify if the password settings match the other instances, and if not, then change the settings and send an invite again.