Azure Web App Easy Auth using Reverse Proxy

My organization manages one single endpoint which must be used to expose web application;

e.g.

We deployed an app in az web apps with Azure AD Easy Auth. (not accesible from the internet and no custom domain).

Our app registration has this callback:

When i try to open any the app using https://contoso.com/app-one/, the browser recirects to Azure Login page, but it redirects back to https://app-one.azurewebsites.net., instead of going to the public website https://contoso.com/app-one/.

Our reverse proxy user Azure APIM.

Question is: how can i make Azure Web App to redirect to public endpoint instead of the azurewebsite endpoint?

Thanks.

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