Outlook webmail: no permission to enter user's data

Hi, I don't know if I am in the righ forum session but I have noticed that, when I access a web version of Outlook and I try to edit the general information to customise the email owner's Name, Family Name etc., the system claims that I have not the privileges nor the administrative rights to do so. Please check the attached image.

I guess I have to tweak some setting in the OVH main panel but I have no idea where to start from. May you help me please?

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