Thanks for your reply. Please allow me to provide some additional information. 

I am the accountant, attempting to enter journal entries or add accounts. The issue first occurred in Desktop 2020. I went back to a different client's QBA file, this time in Desktop 2019. I worked extensively in this file prior to year-end without issues. When I tried to add an account to this file the same thing happened. It is the same error code #19062 00238.

The only change I have noticed is that there is now a new procedure to log into my online account and have my client authorize me to log into the file. This seems like an unnecessary step.