OIDC Provider plugin refresh token support?

I have configured the OIDC provider plugin and created an oauth client for Zapier with authorization_code and refresh_token grant types. However Zapier gives the error: Field named refresh_token not found in OAuth2 results when trying to connect to my app. Is refresh token not supported or do I need some additional configuration?

Solution:

I found I need to send the offline_access scope. Then it works.

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