The repository 'https://enterprise.proxmox.com/debian/pbs bullseye InRelease' is not signed.

Oct 11, 2020
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problem:
Code:
E: The repository 'https://enterprise.proxmox.com/debian/pbs bullseye InRelease' is not signed.

but I installed the gpg key according this doc:
https://pbs.proxmox.com/docs/installation.html

Code:
wget https://enterprise.proxmox.com/debian/proxmox-release-bullseye.gpg -O /etc/apt/trusted.gpg.d/proxmox-release-bullseye.gpg

I checked the md5sum and sha512 and they are right.

Where I can find the right GPG key?