Apple TV web page
My 2016 LG tv does not have the Apple TV app, but I can browse the web on it to the tv.Apple.com/gb page but the “sign” in button does not work. It works on our desktop.
Any suggestions?
The website tv.apple.com uses some web technologies that may not work on TV browsers, as those are not as advanced as Chrome or Firefox.
Select 2016 LG 4K TVs would have the Apple TV+ app from the LG Content Store.
Apple TV+ app - LG Content Store preview - LG
Users with unsupported TVs should consider getting an external HDMI streaming device that supports the Apple TV app. Either an Apple TV box, or a third party device (Roku, Fire TV, PlayStation, Xbox, Nvidia Shield, ‘Chromecast with Google TV’, or select cable boxes with app support).
Get the Apple TV app or Apple TV+ app on your smart TV or streaming device - Apple Support
Device compatibility - Watch on smart TVs and streaming devices - Apple Support