The reply URL must begin with the scheme `https`, and all reply URL values must share a single DNS domain. For example, if the application has a reply URL of `https://login.contoso.com`, you can add to it like this URL `https://login.contoso.com/new`. Or, you can refer to a DNS subdomain of `login.contoso.com`, such as `https://new.login.contoso.com`. If you want to have an application with `login-east.contoso.com` and `login-west.contoso.com` as reply URLs, you must add those reply URLs in this order: `https://contoso.com`, `https://login-east.contoso.com`, `https://login-west.contoso.com`. You can add the latter two because they're subdomains of the first reply URL, `contoso.com`.
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