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Stumbled upon this thread a couple of weeks ago because I also had a recall notice mailed to me for 21B09 3G to 4G modem upgrade and wanted to share my experience. I don't have a C-MAX but the car type is irrelevant to this thread considering this recall is for multiple models of Ford. I took my car into my local dealership here in Bentonville, Arkansas on January 5th, 2022 for this recall. I paid $350 + tax for the modem and did not pay for any labor. I took my car in at 7am and they advised 2-4 hours to complete but they also admitted that I was the first person to come in with this recall upgrade at that location so they have no experience with this at all. They had called me and let me know that the install was completed but needed my car over night as it required programming for the new modem which I already had a feeling it was going to need on their side for FordPass to recognize I had the new modem installed. I got the car back the next day January 6th around 1pm. I asked about FordPass and they had no idea how I would go about getting that working and that I'd have to contact their "Sales" department for something like that so I shrugged it off and went home, opened the FordPass app and deleted my car and added it again just so that it could re-initialize and to no avail, did not show an "Activate" button but figured it would take a couple of days so I left it alone. Fast forward to today January 14th (8 days after I got the car back), I decided to open the FordPass app and the "Activate" button was there so for future reference, it does take at least 4-6 business days for it to recognize the new modem so be patient. I did not call FordPass to open a support ticket and have not called the dealer at all since I got the car back, I just let it be. Went inside of car, clicked the "Activate" button on my phone app, pop up came up on the car screen (SYNC 3 v3.0.20204) and clicked "Allow" on the screen. After that, everything worked: Lock, Unlock and Start without issue. Hope this info helps someone.

You can grab the asbuilt data specific to your VIN from Ford. Index - FordServiceInfo.Com (motorcraftservice.com)