If you have not been counseled and are fully eligible for promotion in the primary zone you cannot be denied appearing before the promotion board. That said, be careful what you ask for. In other words, make sure you have your stuff together before you stir the pot.
You need to take this matter through your chain of command. I would recommend you see your squad leader and ask to see the 1SG and Commander on open door policy. The commander and 1SG will not deny you the ability to see them on open door.
Once you have their attention respectfully and professionally request their assistance in appearing before the promotion board. Provide them the reference that states you should be allowed to appear before the board. Ninety-nine percent of the time you will appear before the next board. Then the ball is in your court and you need to make sure your uniform is ready and that you are properly prepared. If you fail the board it is on you.