I technically only have one line manager but in reality I report to 2 managers. It's a bit odd because it is not totally clear what their differing roles are but the one who is not my LM is the one involved with me the most. My LM on the other hand let's me get on with my work because she trusts me to handle things.
At the beginning it became clear this other manager was a micromanager. Very detailed and wants things done their way (the first point is not a criticism at all). But recently it has become infantalising to the point of intolerable. When I wasnt available on email the other day for about an hour 15 mins due to finishing a task and lunch, I received multiple messages explaining why I must be available at all times.
Recently they have delegated tasks to me but then changed it all and done it themselves instead because I wasnt up to the mark. I am learning how to do these particular tasks for the first time and they are fine. However they are emailing me constant criticisms and copying in my assistant which I find humiliating. Most of the criticisms are just that she would do it a different way so it's wrong, sometimes her failure to communicate and possibly the fact I am still learning how to use the platform.
I have now been told I will need to work with this person on yet another 2 big tasks for the company and im dreading it. It is starting to really affect my mental health. Should I talk to my line manager about this? I'm worried about it fatally damaging my relationship with the other manager but not sure how I can continue on like this.