autodesk forge – “No Write Access” error on buckets/:bucketKey/objects/:objectKey/resumable

I am trying to upload a file to my bucket through this API:

forge.autodesk.com/en/docs/data/v2/reference/http/buckets-:bucketKey-objects-:objectKey-resumable-PUT/

I am getting a 403 error. Not quite sure why that is happening since I have created the bucket myself.

({'access-control-allow-headers': 'Authorization, Accept-Encoding, Range, Content-Type', 'access-control-allow-methods': 'GET', 'access-control-allow-origin': '*', 'content-type': 'application/json; charset=utf-8', 'date': 'Sat, 04 Jun 2022 00:23:05 GMT', 'strict-transport-security': 'max-age=31536000; includeSubDomains', 'x-ads-region': 'US', 'content-length': '28', 'connection': 'keep-alive', 'status': '403'}, b'{"reason":"No write access"}')