First, head to your Company Activity report (Article).
Next, find the transfers you'd like to re-sync.
Then, Click the dropdown button next to the transfer.
Finally, click 'Resync'.
Here's how you can manually re-sync an outbound transfer with QuickBooks Online
First, head to your Company Activity report (Article).
Next, find the transfers you'd like to re-sync.
Then, Click the dropdown button next to the transfer.
Finally, click 'Resync'.