QuickBooks Error Code 103 & 310 is the most common banking error that might evoke due to incorrect bank login credentials. Moreover, the users will receive this error until you update the login details within QuickBooks Online. 

Whenever the bank encounters errors, it stops the users from gaining access to their bank account. Thus, it obstructs users from performing bank-related tasks. Therefore, it is necessary to cross-check the login details before signing into the financial institution's website to resolve the issue. You may contact our professionals for more assistance by dropping a mail.  The professionals will assist you with proper resolution methods.

Read full method: 

Methods to Resolve QuickBooks Error Code 103 & 310

First click on the Verify your Credentials link which is shown within the error message.

Then log out of the bank's website.

After this come back to QuickBooks Online and again enter the same username as well as password in the same format needed in the bank.

Now Click on Update Sign-in Info.

Regards,

Peter