I did eosio with ubuntu for windows 10. Not Bash for windows but ubuntu. The bash won't work because it is too low a compiler version and ubuntu version is higher and allows for c++17 and cmake highest version, etc. Use ubuntu and you get the correct version of bash without a separate bash which is the wrong version of linux. Have to go into Windows 10 settings and allow for, that is turn on enable developer mode. Then go to Windows store and download/install ubuntu for windows and then all the fine high quality developer packages