Azure Debian 11 bullseye-backports "does not have a Release file"

Hello,

Running "apt-get update" on Azure VMs created with "debian-11:11:latest" recently started showing this error:

E: The repository 'http://debian-archive.trafficmanager.net/debian bullseye-backports Release' does not have a Release file.

/etc/apt/sources.list contains:

deb http://debian-archive.trafficmanager.net/debian bullseye main
deb-src http://debian-archive.trafficmanager.net/debian bullseye main
deb http://debian-archive.trafficmanager.net/debian-security bullseye-security main
deb-src http://debian-archive.trafficmanager.net/debian-security bullseye-security main
deb http://debian-archive.trafficmanager.net/debian bullseye-updates main
deb-src http://debian-archive.trafficmanager.net/debian bullseye-updates main
deb http://debian-archive.trafficmanager.net/debian bullseye-backports main
deb-src http://debian-archive.trafficmanager.net/debian bullseye-backports main

I can workaround by removing bullseye-backports. But is this a known issue with the image?

Sincerely,
Kevin

P.S. If this is the wrong mailing list, I apologize for the noise. I saw on https://wiki.debian.org/Cloud/MicrosoftAzure notes:

If there are general questions about the image itself, those can be asked via `mailto:debian-cloud@lists.debian.org`