XAMPP SSL Tutorial https://shellcreeper.com/?p=2573

make-cert.bat

@echo off
set /p domain="Enter Domain: "
set OPENSSL_CONF=../conf/openssl.cnf

if not exist .\%domain% mkdir .\%domain%

..\bin\openssl req -config cert.conf -new -sha256 -newkey rsa:2048 -nodes -keyout %domain%\server.key -x509 -days 3650 -out %domain%\server.crt

echo.
echo -----
echo The certificate was provided.
echo.
pause

I fixed my issue by fixing two paths of openssl for my Xampp with PHP 7.4 at C:/xampp with this file located at C:/xampp/cert/make-cert.bat

set OPENSSL_CONF=../apache/conf/openssl.cnf

..\apache\bin\openssl req -config cert.conf -new -sha256 -newkey rsa:2048 -nodes -keyout %domain%\server.key -x509 -days 365 -out %domain%\server.crt

Hello everyone, here is the solution for your problem:
https://gist.github.com/TheClio69/d7ea7477cf3f28f304ab02f545b6ec96

What has been changed? Two paths have been changed (for more information see the gist).
I published this solution 4 months ago on my github, but forgot to send it here, which is why I am sending this message so late.

where cert.conf came from ?

cert.conf is created in this article which the script is based on: https://shellcreeper.com/how-to-create-valid-ssl-in-localhost-for-xampp/