We can't connect to Commerzbank since 21 June with the message "We couldn't complete your connection. Try again or go back to select a different account provider (571)

You've come to the right place for assistance, bkim. I'll help ensure your online banking account is connected to QuickBooks Online (QBO) so you can manage your financial accounts.

Banking Error 571 happens when you have either closed the consent page when connecting your bank to QBO. Or, your web browser may have pop-up blockers enabled, which affects the completion of setting up bank connectivity.

To resolve this error, turn off the pop-up blockers on your web browser, then reconnect your bank. Once done, please refresh the page to allow the setup to load completely.

In case you're still unable to link your bank, you can manually upload your bank transactions to your QBO account as a workaround. To do this, you'll need to download the entries from your bank's website in a CSV file format.

Once ready, import these transactions to QBO:

1. In your QBO account, go to Transactions and select Bank Transactions.
2. Click on the blue tile for the account you want to upload the transactions into.
3. Select the Link account▼ dropdown and then Upload from file.
4. Choose Drag and Drop or select Files and select the file you downloaded from your bank. Then, select Continue.
5. In the QuickBooks Account▼ dropdown, click the account you want to upload the transactions. Then, Continue.
6. Follow the onscreen steps to match the columns on the file with the correct fields in QuickBooks.
7. Once done, select the transactions you'd like to import and select Continue.
8. Then, click Yes.
9. When you've accepted your transactions, select Done.

Additionally, here's an article that can help you find missing downloaded and previously categorized transactions: What to do if you can’t find downloaded transactions in QuickBooks Online.

Once everything looks good, you can start categorising your entries, then reconcile your account to ensure they always match your bank and credit card transactions.

If you require any additional assistance with bank connectivity, feel free to leave your queries in the comments below. I'll be available to assist you further. Stay safe.