Just sharing the steps I took to be able to use wallet on my phone and watch, which were both purchased in .For the error below, search for 'downgrade Samsung Pay framework' and follow the easiest step for you.BeforeAfterI did a factory reset on my...
We have the same watch and did some tinkering for Pay to work.https://r2.community.samsung.com/t5/Samsung-Pay/Samsung-Wallet-Phone-Watch/td-p/17708701?src=ShareByUserCM
I am using Samsung Pay on my Watch 6 Classic:https://r2.community.samsung.com/t5/Samsung-Pay/Samsung-Wallet-Phone-Watch/td-p/17708701?src=ShareByUserCM