I've got some browser troubleshooting steps to get past this error, Denis1.
Errors like this occur when your cache storage is full. The cache stores temporary internet files from your browsing history to help your browser quickly load the pages. However, having too many files may affect the browsing performance, and may require you to clear it out.
Let's refresh your browser first by clicking the Reload option or pressing CTRL+F5 on your keyboard. After that, close and reopen QBO for the changes to take effect.
If you get the same result, open an Incognito window to access your QBO account. If you're able to log in without getting an error, go back to your last browser and clear the cache. QBO is also supported in other browsers, so you might consider switching to another one.
I'll wait for your update on this. You can leave a reply if everything's okay or if the error persists.
This issue has already reached our engineering team’s concern, pkimber1.
Right now, they're investigating the root cause and are trying their best to address this as soon as possible. You might also want to reach out to our phone support team through this article: https://quickbooks.intuit.com/learn-support/en-us/payments/contact-payments-support/00/376458
They’re currently tracking the number of users affected by this. I’ll also keep an eye on their investigation and will this thread posted know once there are updates.
You always have a space here in the Community so please visit us again if you need anything.
I’m glad to inform you that this issue has already been resolve, pkimber1.
Though, if you’re still unable to get into your Merchant Service Center, it’d be best to reach out directly to the payments team. They can investigate and help further with this.
Thanks for dropping by. As mentioned visit us here again if you have additional question or have other concerns.