Esim appears to have disappeared

Hi. I have £3 credit on my Lebara esim, but when I tried to swap to it on my phone it has disappeared. When I log into my Lebara app it shows my Lebara number and my credit balance. Why can I not switch to it to make calls? It was working fine before.
Thanks in advance

Cancel that. I've found the problem. I had turned off backup! 😕