The same for me, I am on Windows 11, I tried to uninstall and install erlang otp 26 and elixir 1.14.4 many times, but it did not help, I had to revert to erlang otp 25 as before and elixir 1.14.4, it is working normally now.
With otp 26 it hangs forever when I run iex -S mix.
There is indeed an on-going issue with compiling Rebar 3 dependencies on Erlang/OTP 26 on Windows: Both 1.14.5 and 1.15.0-rc0 with OTP-26 compilation hang on Windows · Issue #12589 · elixir-lang/elixir · GitHub
The Windows issues on Erlang/OTP 26 should be addressed by running mix local.rebar and installing the latest Rebar.
