We have recently upgraded to Azure DevOps 2020 on our testing environment, previously we had TFS 2017 and then upgraded Azure DevOps 2019 and now to Azure DevOps 2020.
I am facing issue regarding the agents I had configured in the earlier version. They don't see to update when I click on the update agent link.
I have one agent i.e. POC_2017Agent installed and created with TFS 2017 agent and the last two agents were created and installed with Azure DevOps 2019. After we upgraded to 2020 all 3 of them are shown as Offline, even when their services on the servers are running\restarted.
How can I upgrade the agents manually, if they are not getting upgraded automatically after clicking on the update Agent link?
I don't want to remove them and reconfigure again.