API - user_group_id and secondary_user_group_ids not returned for all users

[Arith]

Hello, I'm attempting to build an application that makes use of the OAuth2 implementation and as part of that I'm fetching the user groups assigned to a user to determine permissions within the app, however some users do not seem to have these properties when calling /api/me. I can't really figure out why or what permission isn't set to return it. The docs aren't very clear about the permissions required.

I've tried to look at the user manually using an API Key and setting the XF-Api-User...

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API - user_group_id and secondary_user_group_ids not returned for all users

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