Update rocketchat-server from 7.15.5 to 8.x via snap not working

Hi, I have a older install on a linux server. I have to upgrade to 8.x cause the Subscription for 7.13.5 is ending on 01.07.

But it doesn´t work. After switching to 8.x/stable release i tried sudo snap refresh rocketchat-server

I get the following error:

error: snap “rocketchat-server” is not available on stable but is available to install on the
following channels:
candidate snap install --candidate rocketchat-server
beta snap install --beta rocketchat-server
edge snap install --edge rocketchat-server
Please be mindful pre-release channels may include features not completely tested or
implemented. Get more information with ‘snap info rocketchat-server’.

–candidate, --beta and --edge flag is also not working. How can I solve this?

snap info is listing a availability for 8.5.1 from edge to stable

Server Setup Information

  • Version of Rocket.Chat Server: 7.13.5
  • Operating System: Ubuntu LTS 24.04
  • Deployment Method: snap
  • Number of Running Instances: 1

Any additional Information

Search carefully here & github on how to do this.