Running in IIS 7 with PHP 7.3. I installed it using composer. Required the autoload.php and used the sample code provided to test the Authorization Flow.
It successfully redirects me to Microsoft and I am able to login with a test user that exists in an Azure AD instance.
I get redirected back to the page with a code.
However, it errors out with the "Invalid state" message.
Is there anything missing in the Readme?