The format of the URL depends on how the site was created: Created with new Sites—The URL will be sites.google.com/domain/sitename. Created with classic Sites and migrated to new Sites—The URL will be sites.google.com/a/domain/sitename. Created with classic Sites—The URL will be sites.google.com/a/domain/sitename.

Here are some steps you can try: Switch accounts: You're currently signed in as [email placeholder]. If you have more than one Google account, or an account for school, work, or your own website, switch to a different account. Check your browser: Use a browser that works with new Google Sites.