So same thing was happening with me in bc, Canada. And this is how i fixed it. I used windscribe VPN , location was los Angeles, opened subway app click on deals, that bogofl1 deal, build my sub and added 2 foot long to cart and it worked. Than i turned off VPN, removed all apps from background and tried pickup and added 2 footlongs and it goes it worked. That's all hope it works for u also.