CardDAV - empty Response | Apple Developer Forums

Hello,

I try to get all contacts from an iCoud Account...

First I run:

< ?xml version="1.0" encoding="UTF-8" ?>
< d:propfind xmlns:d="DAV: ">
    < d:prop >
        < d:current-user-principal/ >
    < /d:prop >
< /d:propfind >

Then I get /xxxxxxxxxxx/carddavhome/ and run:

< ?xml version="1.0" encoding="UTF-8"? >
< d:propfind xmlns:d="DAV:" xmlns:card="urn:ietf:params:xml:ns:carddav" >
    < d:prop >
        < card:addressbook-home-set/ >
    < /d:prop >
< /d:propfind >

This give me the URL https://pXX-contacts.icloud.com:443/xxxxxxxxxxx/carddavhome/ then I send the following request to this URL:

< ?xml version="1.0" encoding="UTF-8"? >
< d:propfind xmlns:d="DAV:" xmlns:card="urn:ietf:params:xml:ns:carddav" >
    < d:prop >
        < d:displayname/ >
        < d:resourcetype/ >
    < /d:prop >
< /d:propfind >

And I get:

< ?xml version="1.0" encoding="UTF-8"? >
< multistatus xmlns="DAV:" >
        < response >
            < href >/xxxxxxxxxxx/carddavhome/< /href >
            < propstat >
                < prop >
                    < resourcetype >
                        < collection/ >
                    < /resourcetype >
                < /prop >
                < status >HTTP/1.1 200 OK< /status >
            < /propstat >

            < propstat >
                < prop >
                    < displayname/ >
                < /prop >
                < status >HTTP/1.1 404 Not Found< /status >
            < /propstat >
        < /response >
< /multistatus >

If I try to run this to the the URL https://pXX-contacts.icloud.com:443/xxxxxxxxxxx/carddavhome/contacts

< ?xml version="1.0" encoding="UTF-8"? >
< card:addressbook-query xmlns:d="DAV:" xmlns:card="urn:ietf:params:xml:ns:carddav" >
    < d:prop >
        < d:getetag/ >
        < card:address-data/ >
    < /d:prop >
< /card:addressbook-query >

I get: Improperly formed XML encountered, unexpected root node

What is my mistake? The first 2 queries work and give me the expected results, the 3rd one should give me a list of the addressbooks and groups and the 4th one should give me all VCards.