403 Forbidden

The server understood the request and refuses it. Unlike 401, authenticating again will not help.

What to do

The server refuses, and logging in again will not change that. Check the permissions on the account, the files or the bucket, and any firewall or IP allow list in front of the server.

Class
4xx Client Error. The request has a fault, or cannot be met as sent.
Registered
Yes, in the IANA HTTP status code registry.
Cacheable by default
No. A cache stores it only when Cache-Control or Expires says to.
References
RFC 9110 ยง15.5.4 · MDN

Every 4xx code

All HTTP status codes, in one table