Anonymous login not working

I want to enable anonymous login on my jabber server. However it does not work.

This is how my config looks like:

{auth_method, [internal, anonymous]}.
{anonymous_protocol, both}.
{allow_multiple_connections, true}.

Connecting internal with an existing account works fine.

Connecting anonymously does not work:

error authenticating: Error Domain=XMPPStreamErrorDomain Code=4 "The server does not support anonymous authentication." UserInfo={NSLocalizedDescription=The server does not support anonymous authentication.}

How can I test/debug further?

Logfile does not really help...

=INFO REPORT==== 2016-02-11 10:37:51 ===
I(<0.368.0>:ejabberd_listener:281) : (#Port<0.1948>) Accepted connection {{46,246,45,70},54519} -> {{46,101,127,231},5222}

If you want to test: xmpp.stefantrauth.de

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