I am having the same problem.

Tried 3 different browsers, clear cache, go incognito, restart...very patient support guy.

Even the desktop app for QuickBooks online would not work.

In the end, apparently, it must be a problem with my computer and I am suppose to call HP.

I am sure HP, who are know for their great support, will be very helpful in fixing my issue with QuicBooks...

If anybody finds the solution to this, please post it here.

Thanks