I updated the Umbraco OpenID Connect example to Umbraco 17.4.2 and added support for lightweight external members. Enabling it comes down to one flag: ExternalOnly = true. But there is one gotcha the docs don't cover. Existing content-based members are not migrated automatically. If you want them to become lightweight external members, you need to delete them first and let Umbraco recreate them on the next login. Full details in the blog post below. https://www.jeroenbreuer.nl/blog/umbraco-openid-connect-example-with-lightweight-external-members/