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Yes. Just make sure that all of the following conditions are met:
In the admin panel section for saml/ldap/etc, "Alternate Login for Specified Users" is enabled
The user is an Admin or has the
login_special_emailpermission AND has been set up with a valid email credential
On the login screen, they click the "Alternate Login" link below the "Authenticate" button.
If the above conditions are not met, external users may experience the following:
Can successfully log in the first time, but not after that.
The password reset email never arrives.
If an admin resends the registration email, they simply get directed to the main login page (with the "Authenticate" button), which doesn't allow them to reset the password.
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