What tends to go wrong
The demo lands well. The economics are compelling. Then the conversation moves into a room you're not in, and the questions change.
Someone asks how it integrates with the ERP the client already runs. Someone asks who onboards the suppliers, and how long that takes. Someone remembers a platform that looked just as good and quietly went unused, not because it didn't work, but because the people doing the daily work never took it up.
None of that is in your deck, so none of it gets answered. The bank doesn't reject you. It just goes quiet.
A bank isn't only assessing your product. It's assessing whether its clients' operations teams will adopt it.
That's a fair question, and a very answerable one, but it needs someone who has worked on that side to help you answer it convincingly.