Agents no longer visible in Microsoft 365 Copilot despite Premium license

I am using Microsoft 365 Copilot in our company work environment and I have a Premium license.

Until recently, I was able to see and access agents directly within Microsoft 365 Copilot Chat. The agents are now no longer visible in Copilot Chat.

Our IT administrator has confirmed that no relevant administrative settings or configurations have been changed in our Microsoft 365 environment.

Therefore, it is unclear why the agents suddenly disappeared.

Could you please clarify whether there has been a recent change to Microsoft 365 Copilot regarding the visibility or availability of agents for Premium users?

I would also like to know where my existing agents should now appear and whether any additional setting, permission, license or deployment step is required to make them visible again.