Sending, receiving, and organizing email in Outlook.com
Thank you for letting me know.
To change language directly from Outlook app, please see https://support.microsoft.com/office/manage-language-settings-in-outlook-8a34d50d-81b4-40c2-b304-b3d043566389 Select a tab option for the version of Outlook you're using.
If issue persists, you’ll need to update your language settings under the "Your Info" page:
- Visit: https://account.microsoft.com/profile/msa-language-settings and sign in with your Microsoft account.
- This will open the "Your language settings" page.
- From there, edit both your Display Language and Preferred Language.
Also, just to be safe, I’d recommend to sign out everywhere:
- Visit: https://account.live.com/proofs/manage/additional Scroll down to Sign me out and select "Sign me out".
- After signing out everywhere, please monitor if the issue persists in the coming hours.
Let me know how it goes.