Visual Studio for Mac has been retired and .net 8 support is limited.
https://learn.microsoft.com/en-us/visualstudio/mac/what-happened-to-vs-for-mac?view=vsmac-2022
you should probably move to visual studio code or jetrider if you want an ide. Your other option is parallels hosting windows and visual studio.
Note: I just switched to swift and kotlin to have native tool support. When .net can produce native libraries, I’ll revisit .net for sharing mobile app code.