Características de Microsoft 365 que ayudan a los usuarios a administrar sus suscripciones, la configuración de la cuenta y la información de facturación.
I will answer you in English based on your previous description. As a friendly suggestion, posting in English forum may help your question reach a wider audience and increase the chances of receiving assistance from other community members.
Hi @Sam Bobes
To help determine what happened, could you please confirm the exact Microsoft subscription name that was purchased (for example, Microsoft 365 Business Basic, Business Standard, Business Premium, E3/5 etc.)?
When you mention that Microsoft is asking you to purchase the subscription again, could you please provide the exact message displayed on screen?
Could you please sign in to https://portal.office.com/account/?ref=Harmony#subscriptions and check whether the subscription appears under Subscriptions?
If this is a Microsoft 365 Business subscription, please also check whether the subscription appears in the Microsoft 365 Admin Center under Billing > Your products, and verify that a license has been assigned to your user account under Users > Active users.