Replying to mark TOTAL OF ALL PREVIOUS POSTS IN THIS DISCUSSION as the SOLUTION. But please continue to post any questions/comments.
This KB article provides an overview on how to performed a controlled restart of MCS and reasons why.  If MCS service is already down as showing in picture skip to step 3. Restart MCS.  [IMAGE] Willman Technical Support Engineer, IDPA Support Dell EMC | Data Protection Division   If We've helped you, please consider giving a kudos to ensure others know this helped and/or corrected the issue.
IDPA - How to restart Management Control Server (MCS) on Avamar.