Hi Pontus E,
Welcome to the Outlook community forum. I am an independent advisor here to help you.
Please, check whether you are using an unsupported language in Outlook for Copilot. If so, try changing the language to English US. Also, keep in mind you need to use the new version of outlook, Copilot doesn't work in the old version.
Let me know if you have further questions.
Kind Regards,