I try to authorise HMRC VAT Connection but get error {"Message":"Global tax partner's api has failed while service the request","state":"Error"}Tried off/on-same issue.

I appreciate the steps you've performed to authorise the HMRC VAT connection, Alexey.

Since you've already been turning the connection on and off, I recommend contacting our Live Support team for assistance. They can look into this further and provide other troubleshooting steps to resolve the error message.

To reach them, follow the steps below:

1. Log in to your QuickBooks account.
2. Click on the Help (?) icon.
3. Scroll down and select the Contact Us button, then follow the prompts.
4. You will be able to request a callback or start a live chat with an expert.

Please know that you're always welcome to swing by anytime if you have other concerns or questions. We're here to help.