I still got this issue, after my Wear OS got an update, where Google Pay was
replaced with Google Wallet.
Adding my card to my phone works perfectly,. However adding it to my Wear OS smartwatch, results in "Call your bank"
I have tried everything, manually adding my card to phone wallet, add it from the bunq app, no difference. Also checked that my phonenumber in the Bunq app is equal to the phonenumber in the Google Wallet app.
I requested support from Bunq, but apparently this is a know issue....