Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Emmanuel
On the link you sent I found:
"If you see Paid with pre-paid card next to the subscription expiration date, you paid for the subscription with a pre-paid code and you can't turn on recurring billing. You can buy a new one at Microsoft Store when the subscription expires."
So, it would seem if Office 365 is bought as part of a package from a 3rd party (e.g. Dell), then you can't set up recurring billing.
Anyway, thanks for your help.