ActiveSync and Horde 17.8.11

Hello,

i have a Server with Plesk 17.8.11 and Horde 5.2.17.

I have configured the server so far. Mails are sent and arrive. Now I want to activate ActiveSync so I can access the calendars on the go. However, I do not succeed. I followed these instructions:
How to use ActiveSync with Horde

But it does not work. Are there any other settings you need to make ActiveSync work?

I have also given my user the...

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