I forgot to cancel realms free trial

A refund cannot be processed directly here, but a refund request can be made through the Microsoft account used to start the Realms trial.

Follow these steps:

1. Go to the Services & subscriptions page: https://account.microsoft.com/services and sign in with the same Microsoft account that was used for the Realms free trial.
2. Find the subscription that was charged (for example, Minecraft Realms or a related Microsoft subscription) and select Manage.
3. If recurring billing is still on and further charges are not wanted, turn off recurring billing or select Cancel (it may appear as Upgrade or Cancel) and follow the prompts to stop future payments.
4. To request a refund for the charge already made, follow the guidance in the refund article for Microsoft subscriptions: https://support.microsoft.com/account-billing/how-to-get-a-refund-on-a-microsoft-subscription-67dca30b-b323-44d5-acc2-e02f9902c472 and check if the purchase and country are eligible.
5. If the subscription was started through a mobile app store (Google Play or Apple App Store), the refund must be requested from that store’s support instead of Microsoft.

If the charge is not recognized or the subscription cannot be found, use the billing investigation steps on the Manage your payments page linked from the refund and “investigate a billing charge” articles in the references.

References:

• Unable to cancel your Microsoft subscription
• How to get a refund on a Microsoft subscription
• Countries with prorated refunds for Microsoft subscriptions
• Get a refund for apps and games purchased from Microsoft Store
• Request refund - Microsoft Q&A
• Can I speak to someone? -- Billing issues - Microsoft Q&A
• investigate a billing charge - Microsoft Q&A