Users who created their WordPress accounts prior to enabling SSO with WP Discourse will be considered to have valid email addresses. The only issue with using non-default registration systems once SSO has been enabled is that user’s email addresses will be marked as invalid. The plugin supplies a hook that you can use to validate your user’s email addresses. Using the hook requires adding a few lines of code to your site. There are details about how to use it here: How to turn off Discourse email verification?.
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