Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Jeff Pohl
Please note that canceling a subscription prevents future renewals, but it does not always automatically issue a refund.
Since you mentioned that this was an in-app purchase, please check which store processed the payment through Apple App Store or Google Play? Because Microsoft cannot process a refund when the payment was collected by Apple or Google.
If the subscription was purchased directly from Microsoft instead:
Sign in to Microsoft Services & subscriptions with the account used for the purchase. Find the canceled subscription and check whether a refund option or confirmation is displayed.
Refund eligibility depends on the purchase date, subscription type, and country or region.
Feel free reply back to this post if you need further assistance, I'll be happy to help.