Please go to https://usestrict.net/my-account/api-keys and click delete next to any active license (if you see one).
Then deactivate/reactivate your plugin and try to connect the API key again. You’re still running the buddypress bridge with an older version of the license manager (we use Product ID now, instead of email address). Activating it should work, but in case it doesn’t, please download the latest version from My Accounts > Downloads and upload it over the old one. Newer versions of WordPress now allow uploading zip files for existing plugins, so you should no longer have to use FTP to do so.