Has my account been flagged?

It appears your new AWS account is experiencing standard verification and sandbox restrictions rather than being "flagged" for any wrongdoing.

For your CloudFront issue, this is a normal security verification process that AWS implements for new accounts. Even though you're an established AWS customer with multiple accounts, each new account typically requires its own verification process. You'll need to contact AWS Support through the console by creating a case under "Account and billing support" category. Explain your situation, mention the CloudFront verification error, and select "Service Limit Increase" as the category with "CloudFront" as the service.

Regarding Amazon SES, new accounts are placed in a "sandbox" environment with restrictions like only being able to send emails to verified addresses. This is standard practice to prevent fraud and abuse. You can check if your account is in the sandbox by going to the SES console, navigating to "Sending Statistics" under "Email Sending" in the navigation pane, and checking your "Production access" status. If it shows "Sandbox," you'll need to request production access.

These restrictions aren't indications that you've done anything wrong - they're standard security measures for new AWS accounts. Contact AWS Support directly to address both issues, explaining your extensive history with AWS and your legitimate use case.
Sources
Moving out of the Amazon SES sandbox - Amazon Simple Email Service
CloudFront Verification | AWS re:Post

Hello there,

Greetings for the day!

For new AWS accounts, there are some services that require to build some usage and billing history before they can be used, CloudFront being one of them. This is a common step for new accounts or when there's a need for additional security measures.

Please note that account verification issues must be handled through AWS Support cases, as they involve reviewing account-specific information that cannot be addressed in community forums.

AWS Support can help you with account verification issues as each account is treated independently and typically requires its own verification process:

1. Open the AWS Support console, and then choose Create case.
2. Choose Account and Billing Support.
3. Include the error message "Your account must be verified before you can add new CloudFront resources" in your request
4. AWS Support will review your case and respond accordingly.

For account-specific concerns, it is recommended to work directly with AWS Support through support cases, as they have access to your account details and can provide the most accurate guidance for your situation.

I hope that the above details are helpful.