iTunes won't let me sign into account
I've been having this problem for quite some time. My Mac was previously set up with an Apple ID with @iCloud.com, and i somehow got it to switch to my gmail Apple ID so that my phone and computer both have the same Apple ID. HOWEVER- my iTunes account on my Mac isn't synched with my iphone's Apple Music for some reason. Every time I try and access my iTunes account on my Mac (so that I can change it to my gmail one that on my phone) it says error 9039 and won't let me do anything!!! Help plz
MacBook Air 13", macOS 10.15