Try activating the 3 month Free Trial - that should resolve the issue (its 3 months free, added to your current account/subscription).
That did not work. It gave me an error message that someone in my family sharing already has a subscription so I can't claim this, and then it took me back to the same page I keep getting that says I don't have a subscription (even though it literally just told me I have one)
You mentioned deleting/reinstalling the ATV app, but you may not have done it correctly - you must RESTART the Roku before reinstalling.
Try this specific order:
1) Log out of the ATV app on all devices.
2) Delete ATV app.
3) RESTART Roku device (both/all devices in your case).
4) Reinstall the ATV app.
Otherwise, this is entirely an Apple support issue: Apple develops, codes, and publishes the ATV app on the Roku (and other) platform, so you'll need to press them about this account/subscription/Roku app issue.
As a member of a family plan, the Apple TV app on Roku has started by asking if I want a free trial AND it also says free as part of Roku subscription so I think Roku have introduced something on to app. Logs in via QR code to iPhone but still get this free trial button to press and sign up. Is it time to go to another stream box?. Hope not as always liked Roku but maybe something going on here...
Roku didnt add anything to the app - Apple entirely develops, codes, and publishes the app to the Roku Channelstore.
Roku DOES occasionally make trial/subscription deals with different streaming services, but again that's handled by the streaming service (and its app and subscription processes).
You can always try the process I previously posted to see if that provides any resolution for you.
Otherwise, if you're having trouble with your Apple subscription and the Apple TV app, you need to direct your customer service/technical support efforts to Apple CS.
