[2023] Why did my Armory stopped producing Orcs.

The button going grey happens when you do not have enough resources to perform the action.
The Orcs in your Mercenary Camp and the ones produced in your Armories are very different, with the latter type being used for Negotiation as a Resource rather than as Units for battle.
We hope the links help to also broaden this topic, but if you are still struggling, please raise a ticket with support and we will be delighted to help you further.  

Reiterating: please raise a ticket with support if you are still having any issues.