Get yourself a user (invite) that is not in any email domains that you will verify or have verified as part of Atlassian Access/organisation setup (i.e. invite your own gmail account). Make this user a site-admin and org admin. Test that you can login and do site and org administration.
Switch SAML on. Test with your normal user. If all works - go remove your gmail one from org admins and site admins and remove site access from it. If the account was a true throw away one – you can also login into id.atlassian.com with you gmail one and request deletion of this account.
If it doesn't work, login with your gmail user and disable SAML.
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