Question about Redirect URL?

i am wondering what I have to put in in the Redirect URL.
I want to configure the Microsoft o365 E-Mail.
Maybe it is possible to do a forward to an internal E-Mail Adress from the zammad installation?

The Zammad installation is on a intern server, it shouldn`t be reachable through the internet.
Thats why I used http:// and didnt configure https://
Where do I find this information?

Thanks for your help

Please follow the documentation - note that a https URL is mandatory as you can’t create the required microsoft app other wise. Microsoft does not have to be able to contact the instance directly.