I am stuck on that message

The error message you're encountering indicates that AWS is currently validating your request to access resources in the specific region where you're trying to launch your Windows Server 2022 instance. This is a temporary situation that AWS sometimes implements for security and resource management purposes.

Here's what you should know and do:

1. Wait patiently: The validation process typically resolves within minutes, but it can take up to 4 hours in some cases. AWS will notify you by email once the validation is complete.

2. Do not keep trying: Repeatedly attempting to launch the instance during this time won't speed up the process and may potentially cause further delays.

3. Check your email: Keep an eye on the email associated with your AWS account for any notifications regarding the validation process.

4. If the issue persists: If you don't receive any notification after 4 hours and the problem continues, you should open a support case with AWS. Use the link provided in the error message to create a case under the "Account and billing" category.

5. Verify account status: While waiting, ensure that your AWS account is in good standing. Check for any outstanding billing issues or security concerns that might be affecting your account's status.

6. Consider other regions: If you urgently need to launch an instance, you could try launching it in a different AWS region where you might not be facing this validation process.

Remember, this is a temporary measure, and once the validation is complete, you should be able to launch your Windows Server 2022 instance without issues.
Sources
AWS, EC2 Instance launch failed | AWS re:Post
ec2 instance wont launch | AWS re:Post
EC2 instance launch issue | AWS re:Post