For anyone else having the same issue I just found a fix that worked for
me.In Paypal under "Money Banks and Cards" select "edit" for the card
with the rewards. Where it shows the rewards select "see details".
Select "Stop using cash back with PayPal...
Having the same issue.Capital One and Wells Fargo are not showing up for
Buy Now in Ebay but the available rewards are shown when logging in
directly to paypal.