When I link my Salesforce org with Gearset, I like to use OAuth as that provides the best security.

Whenever there is an error during the linking process, such as when:

1. The app is blocked (OAUTHAPPBLOCKED)
2. I press Deny on the OAuth consent screen
3. The org has IP restrictions in place that prevents Gearset from completing the OAuth flow

Gearset returns to the Manage Orgs or Configure page without showing me what went wrong!