Thank you for post!
I understand that you are trying to add an OpenID Connect identity provider to Microsoft Entra External ID, but you only see SAML/WS-Fed options.
To answer your question, Microsoft Entra External ID only supports SAML/WS-Fed options at the moment, by default, and OpenID Connect is not supported.
I suggest to choose the SAML/WS-Fed Identity provider
Hope this helps. Do let us know if you any further queries.
Thanks,
Akhilesh.
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