Hello and welcome to the QuickBooks Community, Heather
Currently, there is no way to set reminders for the expiry of Open Bank authorisation periods in QuickBooks Self-Employed.
We appreciate that this would be helpful and will pass feedback onto our Product team for their consideration. If there are any other queries that we can assist with, please don't hesitate to reach back out.
Thanks again for reaching QuickBooks support on the Community. Have a great day!