How can a non-U.S. resident open a U.S. bank account if they have already formed a U.S. company?

Purely sitting outside the US, despite being incorporated and having an EIN in the US, it is very difficult to open an account without one of the owners of the company not being physically present in the US. Whilst W-8BEN would be required, you would still need to be present in the US to open a bank account. All the big banks, BoA, Wells Fargo, JP Morgan Chase, etc. do not open accounts without you not being physically present in the bank branch with all your documents.