Change Subscription of Proxmox VE to pve-no-subscription

In order to update PVE, server needs to be under pve-no-subscription

Error

Following error occurred if the subscription hasn't changed.

starting apt-get update
Hit:1 http://security.debian.org bullseye-security InRelease
Hit:2 http://ftp.debian.org/debian bullseye InRelease
Get:3 http://ftp.debian.org/debian bullseye-updates InRelease [39.4 kB]
Err:4 https://enterprise.proxmox.com/debian/pve bullseye InRelease
  401  Unauthorized [IP: 51.79.159.216 443]
Reading package lists...
E: Failed to fetch https://enterprise.proxmox.com/debian/pve/dists/bullseye/InRelease  401  Unauthorized [IP: 51.79.159.216 443]
E: The repository 'https://enterprise.proxmox.com/debian/pve bullseye InRelease' is not signed.
TASK ERROR: command 'apt-get update' failed: exit code 100

Fix

Got to Updates => Repositories, add No-Subscription in the list, and disable pve-enterprise subscription.

References

Package Repositories