I don’t see a problem for carrier-specific updates even when stored on Google or delivered via OTA or using another SIM than Vodafone for update. The problem is: Does the result work for the functions in question on the vendor-specific network? Please refer again to the before linked article from Fairphone support (which is why I’ve linked it).
In this case, Vodafone is not blocking the update, just the before agreed process between Fairphone and Vodafone didn’t work out as expected and thus unfortunately cannot be delivered to the customer. Please give another ~2 weeks time.
Fo everybody able to read and write in german language please use -> 🇩🇪 🇬🇧 Kein Update vom Januar 2020. From everybody else, I’m happy to respond here.