This usually means one of two things: your phone isn't connected to WiFi, or the installation code has already been used.
Here's how to fix it:
Check you're on WiFi. eSIMs need WiFi to download — mobile data won't work. If WiFi looks fine, try restarting your router.
Check if the code has already been used. Installation codes only work once. If you've installed this code before - even on another device - it's been used up.
Get a new code. Contact us via zable-SIMcard-support@zable.co.uk and we'll send you a new one at no cost.