login bug on a codeigniter project

Hello! I have a project that I installed on a hostinger host running php 8. On login screen after user and password it always returned to login screen. After some tips on internet, I change the hostinger server to php 5.6 and the project runned ok. But I´m trying to make it run on my local machine for development and have the same problem on login screen. How to fix it on IIS?

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Already tried to change version of PHP on my computer without succsess! It seems to be a route problem on codeigniter