I think you might have misunderstood the point. Miscellaneous claims like email/preferred_username shouldn't be used to identify 3rd party logins. Apart from not necessarily being unique, they're also vulnerable to change. Changing your email shouldn't make you lose access to all your accounts. The point of the sub claim is that it's it's unique and stable.
I think you might have misunderstood the point. Miscellaneous claims like email/preferred_username shouldn't be used to identify 3rd party logins. Apart from not necessarily being unique, they're also vulnerable to change. Changing your email shouldn't make you lose access to all your accounts. The point of the sub claim is that it's it's unique and stable.