Unfortunately it looks like Paypal closed the bill-pay option to double-dip on credit card rewards using the Fold card to payoff your credit cards (and mortage, etc)

Only workaround I could find is with Citi cards (double cash, costco visa) you can still call in and make a phone payment via debit card. Not as convenient, takes about 4m to navigate the prompts, but seems well worth it for the extra ~$25 in sats per $1250 (2%) in credit card spend.