Let me provide further details to help you successfully connect your Wealthsimple bank accounts in QuickBooks Online.
To start, did you encounter any error messages upon attempting to connect your bank accounts? Having this information will allow us to provide a more accurate solution.
In the meantime, I recommend logging into your Wealthsimple bank account via their website to check for any ongoing maintenance or temporary outages. You can also contact them to see if they've reported any known connection issues on their end.