Hi @Mats Johansson ,
Welcome to our forum.
Would you like to cancel your subscription for Microsoft? If so, it's suggested to follow the steps as these documents mentioned :
For admin: Cancel your subscription, which also mentions what would happen when you cancel a subscription.
For personal user: How to cancel your Microsoft subscription
If that's not your case or you still need further assistance, please kindly understand here we mainly focus on general issue on Outlook desktop client, considering your issue may be more related to license, in order to resolve it better, it's suggested to contact Mircrosoft store support directly.
Hope that would be helpful to you.
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