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.
