@PhilipDAth I would disagree and only comment so that we have this for future readers.
When organization is initially configured with SAML, after a SAML user login, you will not be able to create a user with that UPN, because Dashboard will say that the user already exists.
Dashboard will be even able to send you alerting emails since you're admin for the organization, but only after user have logged in at least once. It will also to save your profile settings.
The only way Dashboard could perform all those tasks, is if it would store something about the user in backend, create a user or a profile for the user per se.
After you disable the SAML, in about 10 minutes you are able to configure the UPN as local user.