I can share some information about reauthorising the connection, @diane3287.
According to the security requirements of HMRC, it is necessary to reauthorize the connection between QuickBooks and HMRC every 18 months. This is to ensure that any data transmitted from your QuickBooks account to HMRC remains secure.
Don't worry, we'll send you a reminder when it's time to do so, and all you need to do is enter your login details. Once you've done that, we'll handle everything else.
To guide you with reauthorising the connection between HMRC and QuickBooks, check out this article: Set up MTD for VAT in QuickBooks Online and connect to HMRC.
In case you encounter errors when connecting to Making Tax Digital (MTD) in QuickBooks Online: Set up MTD for VAT in QuickBooks Online and connect to HMRC.
If you need further assistance or have any questions about reauthorizing the connection, please don't hesitate to reach out to me. I'm always here to help.