When Silicon Valley Bank (SVB) prompts you to input a PIN in Ramp's bank linking UI, please note that this PIN is a security measure on SVB's side, and differs from your SVB password and PIN used for your debit card.
If you don't remember your security PIN with SVB, you can reset it here: https://www.svb.com/business-banking/online-tools-and-integration/svb-direct-connect