Hi there, Guy. The error you’re seeing suggests your connection with HMRC has expired, there is a data mismatch, or there is a system outage.
To maintain security, these connections expire every 18 months. Please re-authorize the connection in QuickBooks and ensure your HMRC credentials are correct.
You can also check the QuickBooks Status Page or HMRC’s Service Tracker for real-time updates on potential system downtime. If your credentials are correct and there is no scheduled maintenance, try refreshing the app or performing a clean reinstall to clear any glitches.
If you continue to experience trouble connecting, I recommend contacting our Live Support team. They can investigate your account further to identify the specific cause. Consider also checking their support hours to receive timely assistance.
We'll keep this thread open if you need more help.
