Looking at OP's signature I doubt he bought an iPad Air 2 or iPad 2 in 2019. ie, he used an ineligible device to try to claim the offer and now can't use an eligible device to claim the offer - that is a little odd tbh.
This is basically it. Honestly it makes no sense to me either. But having talked with multiple support staff, i had to upgrade my 2019 MBP to catalina (i didn’t since i still need to use 32 bit apps) and use that device to claim the offer.
So i figured it was tied to my apple ID and used the Air 2 to claim it as the button was there(it was already on 13 but judging from support documents, even ios 12.3 would have been sufficient). Then I get the error message asking me to start paying immediately (with no trial). After that, the button disappeared and i get the same response from multiple staff that i cannot claim it with any other device.
I escalated the case to a senior tech and they said the 90 days starts counting down as soon as i submit the order (despite many sources saying 90 days after device activation). Since the mac took almost a month (build to order) to ship and reach me, the 90 days are now up and offer has expired.
For science, i created a new catalina partition on the mac, and same results. The button is of course now completely gone so i guess the offer has been deleted from my account. While apple tv+ is pretty crap and i probably wont miss it, it’s a really crap move to require it to be claimed on a new device only or it will just go away permanently.
