What carrier are you on where the wi-fi isn't working? Mine has been flawless. Thankfully so as Verizon had an outtage the other day in my area and I was forced to strictly rely on WiFi...
I have Mint Mobile which is an MVNO that uses the T-Mobile network. Is your device the Verizon branded or unlocked?
As I said above I suspect these devices will work much better with one of the big four carriers ...but it just isn't working out for me with an MVNO. I was talking with someone who has a regular Note 10 with T-Mobile firmware on the T-Mobile network with a T-Mobile SIM and his device seems to work as I would expect my device to work.
There are other things I don't like about the phone as well such as the curved edges causing accidental touch and slow software updates but those things weren't really deal breakers for me like the WiFi calling and the texting. I have literally tried everything such as different APN settings and I have worked with Samsung support on numerous occasions. Samsung either stops responding to my feedback and in one case they told me it was a carrier issue. Then Mint Mobile tells me they don't support WiFi calling on the Note 10...but the worst part about it is that Mint is selling the Note 10 devices on it's store and those folks probably have no idea the device doesn't play well with Mint.
I read through many many discussions about Samsung devices and the Note 10 and there appear to be a lot of people having issues and honestly I just don't want to deal with all these issues. I would rather have a device that just works and does what I need it to do.