Outlook Autodiscover (Exchangelike) not working with "The Response element in the payload was null"

[Christian WFF]

I am a small hosting provider and I am trying to get Outlook 365 to automatically recognize my Mailserver setup. For that I have set up an autodiscover domain using a response like Autodiscover information for mail clients to setup pop/imap/smtp settings automatically. . But Outlook won't recognize the settings and the Microsoft Remote Connectivity Analyzer tells me that "The Response element in the payload was null.".

For your Reference, here is what this code produces and also what is correctly responded to requests on the respective URI:

<?xml version="1.0" encoding="utf-8" ?>
<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
<Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">
<Account>
<AccountType>email</AccountType>
<Action>settings</Action>
<Protocol>
<Type>IMAP</Type>
<Server>server.hostname.com</Server>
<Port>993</Port>
<DomainRequired>off</DomainRequired>
<LoginName>WhateverEMailWasRequested@hostname.com</LoginName>
<SPA>off</SPA>
<SSL>on</SSL>
<AuthRequired>on</AuthRequired>
</Protocol>
<Protocol>
<Type>POP3</Type>
<Server>server.hostname.com</Server>
<Port>995</Port>
<DomainRequired>off</DomainRequired>
<LoginName>WhateverEMailWasRequested@hostname.com</LoginName>
<SPA>off</SPA>
<SSL>on</SSL>
<AuthRequired>on</AuthRequired>
</Protocol>
<Protocol>
<Type>SMTP</Type>
<Server>server.hostname.com</Server>
<Port>587</Port>
<DomainRequired>off</DomainRequired>
<LoginName>WhateverEMailWasRequested@hostname.com</LoginName>
<SPA>off</SPA>
<Encryption>TLS</Encryption>
<AuthRequired>on</AuthRequired>
<UsePOPAuth>off</UsePOPAuth>
<SMTPLast>off</SMTPLast>
</Protocol>
</Account>
</Response>
</Autodiscover>

I've been banging my head all day on this, the XML is valid and obviously parsable (otherwise it responds with a different error), the "response" element is there, I even looked up the XSDs on MS Open Standards but for some reason the Tester remains adamant that there is no Response element.

I've also tried searching these forums, but most responses are several years old and not even close to what I'd need. Any help would be greatly appreciated, thank you!

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