Hey there! Nice to meet you!
Based on your description and since you have tried checking your accounts to no avail, kindly follow the guide through the official Microsoft website to investigate the charge from Microsoft through this link:
If you're able to find the transaction, you can check if it is eligible for a refund through this link:
You may also try contacting Microsoft Support for further assistance in tracking the transaction:
Type "Billing Issue" > Scroll down to Sign in to Contact Support > Microsoft 365 and Office > Billing and Payment Updates > Confirm > Chat with a support agent in your web browser
If you and the Support Team are unable to find the transaction in all of your accounts, you'll need to contact your financial institution/bank directly to dispute it, and they may process a refund.
You may also need to have your card blocked and request a new one.
Thank you for your kindness and understanding! Please let me know if you need anything else.
Best regards,
Darhyl