Http POST IOS DEVICE Status 0

Hello guys I’m needing your help. I have a Drupal 7 backend. I’m trying to login with this CMS but I’m getting the same error over and over again. I’ve tried with Postman, Insomnia, test-cors.org and the CORS seems to by fine.

This is the result of the test-cors.org

This is the console.error trace:

My code is:
56%20PM

I’ve tried with GET requests and works perfectly but with POST I aways get the same error… ANY IDEAS