Hi @jason_7dwarves,
Welcome to the Auth0 Community!
The Setup segment of our Custom Token Exchange documentation presents how to enable it for you application by setting the allow_any_profile_of_type attribute under token_exchange to ["custom_authentication"]when creating or updating the client via the Management API.
However, at first the documentation also states that:
Custom Token Exchange is currently in Early Access for Enterprise customers only. Reach out to your Auth0 contact to request access.
This would be the requirements to use the new Custom Token Exchange feature.
Hope this helps!
Best regards,
Remus