I'm not sure what an Auth-Code contains, https://www.bluehost.com/help/article/epp-auth-code is the closest I could find with regards to it. However, the steps for transferring your domain should be quite simple.
- Log into your DNS registrar's management portal that owns your domain. Add the
www
CNAME record for your Azure Static Website generated URL. - Verify CNAME propagation by entering www.domain.org at dnspropagation.net and verify your static website address is returned.
- Go back to the portal, enter the CNAME and hit Validate.
You can review this process on https://learn.microsoft.com/en-us/azure/static-web-apps/custom-domain.