Free Tier disabled for all member account.

I understand your concern about the Free Tier being disabled for your member accounts in the AWS Organization. Let me clarify the situation for you.

When you create an AWS Organization, the Free Tier benefits do not apply individually to each member account within the organization. Instead, AWS applies the Free Tier benefits to the total usage across all accounts in the organization.

In your case, even though you created two new accounts in December 2024 and added them as members to your organization, they will not have individual Free Tier benefits. The Free Tier is activated for the organization account, which is correct, but it will not show as activated for the member accounts.

This is the intended behavior for AWS Organizations. AWS aggregates the usage across all accounts in the organization to calculate the use of AWS services under the Free Tier offers. Only one account within the organization (typically the management account) can benefit from the Free Tier offers.

It's important to note that this doesn't mean you can't use services within the Free Tier limits on your member accounts. It just means that the usage is tracked and applied at the organization level, not individually for each account.

If you need to track Free Tier usage, you can do so through the management account in the Billing and Cost Management console. The management account can opt in to receive Free Tier usage alerts, but these alerts are not available to individual member accounts.

If you require individual Free Tier benefits for specific accounts, you would need to keep those accounts outside of the AWS Organization. However, this approach may not be practical for most organizational structures and use cases.

I hope this explanation helps clarify why you're seeing the Free Tier disabled in your member accounts. It's not an error, but rather the standard behavior for AWS Organizations.
Sources
Free tier with AWS Organization | AWS re:Post
Understand when AWS Free Tier starts and expires | AWS re:Post