Take it the tablet is fully updated?
Have you tried another delete and reinstall of the app?
Have you tried using your phone as a hotspot, in case somethings wonky with your Wi-Fi?
Speaking of Wi-Fi, have you rebooted your router?
Very odd for sure!
Report it to staff via live chat. By clicking “chat online” within the green box, make sure to avoid “get help quicker” as this is a bot.
You could try emailing support using the address in the below picture.