Good day, @idf_e276927a-5e0.
Let me share you the info on how to sign up QuickBooks with your Bank of America business bank account.
Here are the quick steps:
You can also add a new user to your Online Business Suite and edit a user once you have created an account. For more details, you can check this all in this link: Bank of America (BofA) user setup for Online Business Suite.
Please let me know if you have additional questions. I'm here to help you anytime. More power to you and your business!