Before we start, may I know which bank you're trying to update? Did you encounter a specific error code or message? This can help me verify if there's an ongoing investigation so I can provide accurate steps to fix this.
There are some possible reasons why QuickBooks Self-Employed (QBSE) isn't updating your bank account. Here are some of them:
The bank is performing system maintenance.
There are notifications from their website that need your attention.
To get this resolved, let's refresh the bank connection in your QBSE account to show all the missing transactions. Here's how:
Go to the Gear icon.
Select Bank accounts under Transactions.
Click Refresh all.
If the manual update doesn't work, the issue may be on the bank's end. I'd recommend signing in to their website to check if there are alerts that need your attention.