This domain has already been used on Galaxy

The error “This domain has already been used on Galaxy” indicates that another user is already using the domain you're attempting to use.

You might be logged into the wrong account if you own the app/domain but have several Galaxy accounts. For instance, if your app https://appname.com is under account2 but you're logged in as account1 in the terminal, you'll encounter this issue.

To resolve this, execute:

Then, log in with the account that owns the app/domain you wish to deploy.