Duplicate e-mail addresses not allowed
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This is actually a feature of WordPress, but it prevents different accounts with the same e-mail to log in.
See https://wordpress.stackexchange.com/questions/144185/allow-duplicate-email-address-for-different-usersThe most important reason looks to be the “forgot password” feature.
However, when using federated auth, this is not needed.
Hence, the duplicate mail check is not needed in this scenario.I’ve tried removed the check in wp-includes/wp-user.php (around line 1953) and that seems to work. Don’t think that much will break.
Will see if this can be fixed, but since this is in core, I’m not sure.https://www.ads-software.com/plugins/simplesamlphp-authentication/
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