This may be what is doing it. Drturtle, I see that you recently purchased a subscription for your newly upgraded WOW account. That order appears to be “queued” right now.
We give something we call ‘grace time’ when a subscription is created. It’s time you can use the play with while your order is being processed - but you don’t technically meet the game time requirement to use the boost.
Sit tight for a little longer and allow that order to finish processing.