Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi @Luis Silva
Please first make sure that your Microsoft account’s country/region and billing address are both set to Portugal, then remove and re-add your payment method. You can also try entering the NIF using digits only, without spaces or punctuation.
Please also check that your card details are current and that there are no overdue subscription payments on your account.
If the NIF is still rejected even though all billing information matches, this may require Microsoft billing support to review the checkout validation.
Please note that this is a user-to-user support forum. Moderators and contributors cannot access accounts or Microsoft’s back-end systems. We can only provide technical guidance on reported incidents, requests and ideas
Thank you and have a nice day