MAC App - Won’t open my company.

I’ve been using Quickbooks Online for the last several years and have been very happy with it. Got a new accountant and he talked me into switching to the Desktop version which was a huge mistake. Trying to import my files from the online version turned out to be a disaster. Anyway, I swtiched back. Now, I have the app on my MacBook Pro and it’s very buggy. I have a closed company that I can log into and a personal account as well. I can log into both of them but the one I want to log into will not let me, it kicks me right back to the log in screen. PLEASE FIX THIS!!!

Big Mack 69 about QuickBooks