A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Specific suggestions appreciated! Here is admin doc related section and more info on scopes. Here is github issue.
I think you are getting confused there, the doc you are linking to are for linking an external application to your Nextcloud account, whereas your diagram seems to be connecting Nextcloud to an external IDP.
You may be wanting : https://apps.nextcloud.com/apps/oidc_login or https://apps.nextcloud.com/apps/user_saml