I created by account with my own email, but they forced the addition of a gmail for some service, so my account has two different usernames.

Worse, if I use the Google account login for a third party service it will use the fucking gmail account for notifications. I only learned this after they sold their domains off to square space and I had to try and hunt down my logins again and discovered that they hadn't been moved to my square space account with the same email but had been moved to a new account they created using my Google account.