I just installed Wechat on my Samsung S23 Ultra. I had a lot of problems logging in. After much frustration, toggling between old and new phone and after 2 days and many tries, I finally managed to so do. So I am sharing my experience for the benefit of other readers here.
In my case, I finally realised that the problem lies with Wifi 6. I think the latest Samsung UI and WeChat does not recognise Wifi 6 yet on this latest Samsung Model.
I tried using mobile data to login and was finally successful on the second try. Remember to force stop the app, clear data and cache first before doing the login.
All the best and Happy New Year 2024 to everyone.