Lambo,

So in other words, as a federal employee or perhaps retiree, under the FEP system, you optionally excluded your spouse from your FEP coverage in prior years, and she remained on the ACA plan, so you could garner a financial advantage for yourself and spouse.

Perhaps this was due to the availability of the enhanced ACA premium subsidies, perhaps for some other reason.

But now, it's not financially advantageous for you/your wife for her to stay on ACA, and you two have decided it's better for you for your wife to be on your FEP plan.

You don't provide numbers about the actual cost differential; and good for you and your wife for being able to "game the system";

but you and your wife don't sound impoverished or in need or unable to afford health care without the enhanced ACA subsidies, and you don't indicate any reason whatsoever that your wife should not be on your FEP plan in the first place.