We encountered similar error (403) while doing identity profile import. Some reason it says method not allowed.
We tried following:
Try 1:
POST: https://{tenant}.api.identitynow.com/v3/identity-profiles/import
In body: Posted full JSON of lastly exported ID profile with few update on source
Result: Error 403 - Method not allowed
Try 2:
POST: https://{tenant}.api.identitynow.com/v3/identity-profiles/import
In body: form format [ Key = “file”, value = “selected txt file where our ID profile json with update was located”
The identity-profiles import worked for me. Here is an example cURL call that works on my environment. Please see if you can spot any differences with what you are attempting.