I appreciate you reporting this issue to us, mereprize.
We've received reports from other users who encountered the same error message when trying to access their QuickBooks Online (QBO) accounts. I can share the initial troubleshooting steps for us to isolate the issue and if the error persists, reach out to our Support Team for further assistance.
Since this can be a browser temporary problem, I'd recommend accessing your account through your browser's incognito mode:
When the problem persists, I'd encourage contacting our Support Team to add you to the list of affected users. This way, you'll be notified promptly with any updates regarding this issue. Here's how:
1. In your QuickBooks Online company, go to Help (?).
2. Select either of these tabs:
Assistant tab and type Talk to a human.
Search tab and click on Contact us to connect with a support expert.
3. Choose how you want to reach us (phone or chat).
We'll be here in the Community if you have further updates about the error message you've encountered accessing your QBO account. We'll do our best to assist.
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