Error while trying to assign Company Id to Account members Using Forge BIM 360 API

Question

I tried to use postman to assign default company ID using the PATCH https://developer.api.autodesk.com/hq/v1/accounts/:account_id/users/:user_id TO users. But it only works for a couple users and for most I get an error saying "code":1006,"message":"You have reached the maximum number of members for BIM 360 Docs and Design Collaboration" and I'm not sure what the problem is or how to get around this. Any help is appreciated. Thank you