As a 100K I always select the free Agent Assistance.
Even so, at MCO I was charged $25 for my boarding pass.
I wrote in to F9, and was reprimanded that Agent Assistance does not include a boarding pass and the charge is correct. I am stumped.
This same thing almost happened with me & my wife at MCO. It keep giving me an error to pull up my boarding pass in the app & I tried several times and even showed the agent the error. Then I was able to pull up my reservation on the app to show it was included but the agent said no its not on the reservation so its not included. I kept arguing with her & finally the other agent told her this is just the baggage drop area so they don't charge to print the ticket & they printed ours for free. So even if you do have it included be prepared to have to fight to get it for free or they will try to charge you.
Also another bad glitch is if you do try to change your ticket to another date it will then try to charge you $10 per person for the agent assistance when you try to change your ticket. So you have to cancel your ticket get a refund & book again.
Always something with Frontier. I would go to another airline but they are soo cheap & with 100k the extra legroom seats & baggage really come in handy with longhaul flights. No, to mention the cancellation and refund is nice with the works.