Testproject agent showing error " Agent not authorized"

We are running three agents from client machines. I am creating test and setting up job for those three agents. In agent tab, agents are showing in connected mode but when I am executing job then Job is processed on client machine. When I do restart the agents then It shows me error “Agent not authorized , Click here to register your account”. This problem I am facing from last week. I had done re- register agent but this is not permanent solution. Please reply on this ASAP.

I believe it’s a global issue. I noticed many threads about the same error.

I face the same problem, and I haven’t done any changes in the last week to my project or environment.

So I believe it’s an issue on the platform.