I have the same problem, though with a few variations (for neither the better nor the easier). To wit:

I start QB 2019 Desktop and enter the password for the chosen company file; the "admin" user is the only user. As it always does, QB churns for a while, reopens the four report windows left from the previous session, and (here comes the irritating part) puts up the attached modal dialog box stating that access to Intuit connected services (Payment, Payroll, TSheets) requires an Intuit account". I have two radio button choices ("admin" and "not the admin") and buttons to Continue or Cancel). Unfortunately, neither Continue nor Cancel do anything. A text box under the "admin" option suggests I "Enter admin's email or user ID", but I am unable to type anything into it.

The only feature that works is a link to "Why do I need an Intuit account?". Clicking it opens Edge and points to https://quickbooks.intuit.com/learn-support/en-us/manage-intuit-account/admin-log-in-when-creating-a.... Actually, not really. Edge opens a blank template page with no information on it and I have to paste the link into Firefox to actually read something. Sadly, this link simply says to pick admin or not and click Continue . . . which doesn't work.

Because the dialog box is modal and neither of the buttons work, there is no way to move beyond it and my only recourse is to terminate QuickBooks from the Task Manager.

I have never used any of Intuit's online services and for the same reasons noted by others in this thread, I have no intention of ever doing so. I just want to be able work on the QB file in the comfort and privacy of my own computer.

Will someone from Intuit please tell me (and us) how to fix this ridiculous situation? Thank you.