Go to the page of Username Retrieval. Enter the button of Continue after entering the email address of your GoDaddy account. If a security challenge is available, complete it. If you have a GoDaddy domain name, enter any domain name that is linked with the account in the Domain URL field and then enter the button of Filter.
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Go to the Retrieve Username page.
Enter the Email address for the account and click Continue. Complete the security challenge if it's offered.
If you have a GoDaddy domain name, in the Domain URL box, enter any domain name that's associated with the account (for example, coolexample.com) and then click Filter. We'll immediately send a one-time-use PIN to the account email address.
In the Verification Code box, enter the PIN we sent you and then click Continue. We'll show your username and Customer Number.
Sign in to my GoDaddy account
Sign in to your GoDaddy account to open your products or manage your domains and account settings.
From the GoDaddy home page, select Sign In (on mobile, select the person icon person icon).
select sign in
Under Registered Users, select Sign in.
registered users sign in
Enter your Username or Customer # and your Password, and then select Sign In. There's also an option to sign in with your Facebook or Google account.
More info: GoDaddy 365 | O365 GCC High
Regards,
Bruce