Hi @Anti89 ,
Your question is related to webmail for Office 365, I suggest you post this issue to Microsoft 365 for Outlook forum:
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
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