To provide the most accurate resolution, could you let us know if you encountered a specific error message while linking your RBC Mastercard to QuickBooks?
For now, I recommend checking your bank’s website for any bank maintenance or updates, as these can cause the issue. You can attempt to link the account again using a private browser to ensure a fresh connection.
As a workaround, you can manually upload your transactions using a CSV file from RBC. Once the account is successfully linked, exclude these manual entries to prevent duplicates in your books.
You’re always welcome to post here if you need more help.