Minecraft on Ipad appears to lose worlds after I sign in to microsoft

Mis hijos pidieron iniciar sesión en Microsoft para poder jugar Minecraft en Xbox y iPad. Iniciamos sesión en iPad y cuando lo hicimos, la aplicación en el iPad no se iniciará. Reiniciamos el iPad y todavía no tuvimos suerte. Terminé eliminado y reinstalando Minecraft en el iPad y entré pero perdí su mundo. Acabo de probar con el iPad de mi hija y lo mismo. 

Estoy tratando de ver si hay una manera de recuperar su mundo en lugar de tener que eliminar la aplicación y perder su mundo.

Gracias.

lo que podria hacer en estos casos talves sea el jugar en xbox y ver si aun tiene esos mundos y si es asi , buscar alguna opcion que diga cargar o juardan en

[Translation- what I could do in these cases is play on xbox and see if you still have those worlds and if so, look for any options that say charge or play in]

Hi, Your kids trying play the game in both devices with same account?

No they have separate accounts.  

Did you manage to get the worlds back on your son ipad? 

We are going to try today and I'll post back.

One thing I have noticed when my kids play minecraft from tablets is it is very demanding of memory on the tablets. If they get impatient while things are loading and double tap anything it can crash the game. They have learned to wait till everything loads including their avatars and it seems to get them in. Another thing to do is make sure nothing else is running in the background. I haven't had to delete the app to get it to work but I have had to hard reboot the tablets. 

We have taught them the same thing and closing other apps.  This wasn't that.  Basically Minecraft was working fine but once we went to sign them in that's when it kept crashing the app.  I'm not sure why logging would do that but to me it seems like a bug within the minecraft app for some reason.