No resume on AppleTV

On what device is this happening?

Verify that you are signed in with the Apple ID account that has the subscription or purchase, as watch progress should be saved online as an account property.

Paused content should be reflected as partially watched in the Up Next queue row in the Watch Now tab. It would show similarly in the Details page of a movie or series. Continuing from there should resume from where you paused it.

Verify that Use Viewing History (or Use Play History) isn’t deactivated for your account on any of your devices.

If it is not working for you as it should, then try toggling the setting for Use Viewing History off and then on again. Or use the Clear Play History option, if that is on your device.

If the issue persists, then contact Apple Support.

If you are using the TV app then the up next queue will keep track of all content from connected apps, including resuming where you left off in a particular title.

Are you using the app on a Roku or other 3rd party device? If so then it may be related to an issue on those devices, as noted by some other users recently, and it would be best to work with Apple support to resolve that problem.

As above it may due to an issue occurring on certain 3rd party devices, and it’s best to consult directly with Apple support.