Hi Sean I,
Welcome to Microsoft Q&A forum.
As I understand, you are experiencing issue in Azure Arc SqlAgent Extension as Failing or Stuck.
After uninstall and reinstall some still have issue, for such servers could you please ensure that the Azure Arc agent and SQL Server version are up to date and the Azure Arc agent has the necessary permissions to install and manage the SqlAgent
extension.
Check that the machine can communicate with Azure services by verifying outbound internet connectivity.
Also look at the options suggested in the below mentioned link to troubleshoot:
Let us know if this helped or you are still stuck.
Awaiting your reply.
Thanks