The technical case was updated with the following information on March 28th, 2025:
NetApp Support Site - JiraNgage - CONTAP-196995
Here is the minimum recommended release with this enhancement:
9.16.1RC1 - 9.16.1P2
9.15.1RC1 - 9.15.1P8
9.14.1P4 - 9.14.1P11
Other options would be to use the HTTP protocol to send these config backups to Artifactory or switch to a web server that allows POST requests for HTTPS.
Please refer to these docs:
How to setup cluster configuration backups using a web server with HTTPS enabled - NetApp Knowledge Base
Commands for managing configuration backup schedules
Updated to "NetApp Release 9.16.1P4: Tue May 27 23:22:56 UTC 2025" though we still are seeing the backup attempt to use POST for HTTPS which results in a 405 return status.

ONTAP is reporting the following:
Description
This message occurs when the configuration backup cannot be uploaded to the destination URL.
Event
configbr.uploadFailed: Configuration backup file /mroot/etc/backups/config/<hostname>.8hour.2025-07-07.18_15_01.7z cannot be uploaded to the destination URL https://<URL>.com/artifactory/<>/NetApp/backups/<hostname>/<hostname>.8hour.2025-07-07.18_15_01.7z. Error: 'HTTP response code said error : The requested URL returned error: 405'.
Action
Ensure that the destination URL is reachable, the protocol in the URL is supported, and the user credentials are valid.
Either we misunderstood the feature request implementation or said implementation isn't in this version?