I was just advised over the phone to send an email detailing the technical difficulties I am encountering. When I try to connect to QuickBooks online from the connections page, before I can even enter my log in information for QuickBooks, I am receiving this error message:
This has been happening since Friday morning.
I have tried to clear the cache and use a different browser
about 4 years ago
Edited: There may be some maintenance/issues going on. Check QuickBooks Online API status here.