I'm getting a "credential already in use" error

This error means the sign-in method you're trying to link (Google, Apple, or Email) is already connected to a different CraftNote account. Common causes: you previously created a separate account with this sign-in method, or someone else used this email to create a CraftNote account. To resolve: if you have notes on both accounts, contact support to help merge them. If the other account is empty or unwanted, sign in to that account first, delete it, then try linking again.