Hi Marco,
I understand that the DirSync deactivation has lasted for over 72 hours. To help you troubleshoot the issue, please run the three PowerShell cmdlets (in Windows Azure Active Directory Module for Windows PowerShell console)in the SOLUTION tab from the article you provided and send the result screenshots to us.
To protect customer's sensitive information, we suggest you send the screenshots via private message (PM). I have sent you a PM, and here are the steps to check it:
1. Please go to "Your details" section on the right side of the community site.
2. Click Private messages.
3. Click the subject title of the response to read the message.
Thanks,
Bourne Zhang