Account Code Not Showing/How to create Account Codes for Xero:
If your Bank Account is NOT showing up you may not have set a code for it in Xero. All normal accounts must have a code. For bank accounts however, it is optional. If it is not set, 3rd party plugins and software like eXconnect cannot reference it.
To change the code for your Bank Account in Xero, go to your Chart of Accounts section and edit the Bank Account details.