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Dear G Chandler,
Good day!! Thanks for posting your concern in this Microsoft Community.
Per the description shared, I understand your concern and I have noticed the similar concern by the other user in this community and where the problem is caused the AD attribute, please refer to this thread: Language in Office set to English, yet everything is showing in Swedish
So, please contact your IT admin whether your tenant is a Hybrid tenant or a pure cloud tenant and if it's Hybrid, please check the attribute explained in the referred thread and ask the IT admin to change the preferred changes about it.
If it's completely a cloud tenant, I suggest you to contact the IT admin and request them to raise a support ticket from the Office 365 admin center for further investigation with related team. Open the Office 365 admin center> Support> Help & Support
Thanks for your patience and understanding.
Sincerely,
Mia | Microsoft Moderator