Getting that error message when trying to post in Community. Please help, tried doing all the troubleshooting but still the same. QuickBooks Online

I appreciate you reaching out to us, Kimmy7.

I've seen that you've posted twice in this forum with the same concern. Don't worry, my colleague has already provided a solution to help you rectify issues. Feel free to visit this link: https://quickbooks.intuit.com/learn-support/en-us/other-questions/re-getting-an-error-message-authentication-ticket-mismatched/01/1558053#M180468

We'll keep this thread available if you need further assistance.