Had something similar while setting up apple TV on a non-apple device for my parents, also had no apple devices. Turns out, in my case at least, the warning wa

Had something similar while setting up apple TV on a non-apple device for my parents, also had no apple devices. Turns out, in my case at least, the warning was a little misleading. It required me to log into their apple / icloud account and accept some terms, I did this with a normal browser (again non-apple) and the warning went away. May be different in your case as I was setting up a new account for them.