You should go online to adobe.com and login with your Adobe ID.
If can't login to your user account with the AdobeID that is associated with your current subscription plan , see if you're able to request a password change.
If you're able to login go to Manage Account and check for any discrepancies like the AdobeID is correctly associated to your primary email when you subscribed and not a secondary or alternate email address, for example.
You can also check if the current subscription is being used in more than two computer devices.
If it is, deactivate or remove the devices that you are not using and only activate for the device you're currently using.