Ask HN: How to Disable Copilot in Office365?
2 threads
https://support.microsoft.com/en-us/office/turn-off-copilot-...
https://learn.microsoft.com/en-us/answers/questions/2181664/...
If these do not solve your issue, please reach out to Microsoft support to inquire, create a paper trail (in the event of future regulatory or legal class action), and update us accordingly.
Cancel the subscription and take the offer for the cheaper, but copilot free msoffice.