PHP can't write files in IIS using Edge and Windows Authentication

Question

I am running PHP through IIS on windows, and using the Integrated Authentication for using domain users.

The following code works when accessing a page in IE 11, Chrome and Firefox.

$dir = dirname(__FILE__);
$dir = realpath($dir.'/../storage/logs');

$filename = $dir.DIRECTORY_SEPARATOR.'my-log.log';
file_put_contents($filename, 'hello world');

When accessed in MS Edge

PHP Warning: file_put_contents(C:\websites\my-site\api\storage\logs\my-log.log): 
failed to open stream: Permission denied in 
C:\websites\my-site\api\public\permissions.php on line 11 

(It works in the Edge-Dev that is based on Chromium, it is only a problem in the traditional / EdgeHTML version that has the problem.)

The code works in Edge too if I turn off the windows authentication. I know that I am typing my password correctly because if I don't I get a 401 unauthorised message from IIS.

This issue is not just my computer; it has failed on all 4 laptops we've tried it on. But does not seem to affect servers, only desktop Windows.

Update

As per Deepak-MSFT's suggestion I added my computer's name to the intranet, but it didn't change anything. The name is like laptop-4.example.com I added it both with and without http and *.example.com was already in trusted sites, leaving it in or removing it does not seem to change anything.

Answer 1

It appears that for some reason Edge seems to prefer having NTLM before Negotiate in the list. Don't know why, but it has solved the problem. I can reliably revert back to Negotiate to cause the issues again, so its pretty likely to be the cause.