Can't connect to my Windows instance using RDP

Hello.

Is RDP allowed in EC2's security group inbound rules?
If RDP connections are not allowed in your security group, please add a rule using the steps in the document below.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/working-with-security-groups.html#adding-security-group-rule

If the Windows Firewall may be blocking your access, please troubleshoot using the steps in the document below.
https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/troubleshoot-connect-windows-instance.html#Troubleshooting-Remote-Desktop-Connection-issues-using-AWS-Systems-Manager