Hi,
As witten here OAuth 2.0 Authorization header not being added by Postman · Issue #4140 · postmanlabs/postman-app-support · GitHub the authorization module cannot handle accestokens with tokentype Bearertoken the same way as it doe for tokentype bearer. So there is no way so get the token in a collection and automatocally use it “from parent” in the calls under that collection. That would be a good addition.
Regards,
Owin