I can help you resolve bank connection issues, @Hm bookkeepers.
You may have recently updated your Metro bank online banking credentials, or the credentials are incorrect. To fix this, I recommend editing your bank feed sign-in info in QuickBooks Online. Please ensure your browser doesn't autofill the username and password field.
Here's how:
Go to Bookkeeping, select Transactions, then select Banktransactions.
Locate the tile for the account that generated error 103.