Publish Exchange with Azure App Proxy?

Trying to get exposure to azure app proxy by publishing ECP (Exchange Control Panel) via app proxy. Publishing OWA (Outlook Web App) is easy, and just a matter of using the /owa virtual directory in the url. The difficulty with the ECP is that it uses a separate virtual directory, but authenticates using the /owa/auth/logon.aspx page.
The closest I've come is to set up an OWA and ECP "application", with an internal URL of https://ex2016.contoso.internal/owa and https://ex2016.contoso.internal/ecp respectively. Likewise, external URL's are https://owa-contoso.msappproxy.net/owa/ and https://ecp-contoso.msappproxy.net/ecp/
When I do this, going to the ecp url routes me to the owa auth page (as expected), however once I authenticate it loops back to the owa auth page again.
Any ideas? I've tried setting the 2 apps with just the root url and then sneaking in the homepage via this method (https://blogs.technet.microsoft.com/applicationproxyblog/2016/04/06/setting-the-right-link-for-application-proxy-applications-in-the-azure-ad-access-panel-and-office-365-app-launcher/) but all that does is try to redirect me to the actual hostname of the server.
Thoughts? Experience with this? TIA!
josef maungAsked:
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MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
Hi Josef,
If I am not miskaten you should have the smae URL for ECP and OWA.
i.e. https://mail.contoso.msappproxy.net/owa/ and https://mail.contoso.msappproxy.net/ecp/
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Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: MAS (MVE) (https:#a42600393)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

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