Can't download on one of my devices

Lifetime plex pass user - Downloads work on all of my other devices. Have purchased a new tablet and no matter what settings I try it just refuses to download. The file moves to teh queue for a moment, then fails straight away with doanload failed. I have rebooted the tablet, reinstalled plex, factory reset the tablet. Nothing works.
Tablet is a Xiaoxin (lenovo) pad pro 2025

Oh and the new Plex experience sucks! Did nobody learn from Sonos’s brand killing blunder when they released a fundamentally broken app?