Hello, @Kylie23. Let me assist you today so you're able to get around the error you've experienced when connecting to HMRC.
It's important to check the email confirmation from HMRC after trying to link your QuickBooks Online account with Making Tax Digital (MTD) for submitting a return. This will confirm if the connection was successful, which can take up to 72 hours.
To explain further what you should do when seeing the error, check out this article: Fix MTD issues and errors in QuickBooks Online.
For more insights about how the latest Making Tax Digital (MTD) changes and how it affects your business: Everything you need to know about Making Tax Digital (MTD) for VAT with QuickBooks Online.
You can always reply or reach out to us again if you have any further questions about managing your taxes and other transactions. I'll always be ready to assist you.
