iOS app crashing

I added my son as a child under my account on account.xbox.com so I could restrict server tab access in Minecraft. Then I realized that also Blocks access to my realm that I pay for. So  I removed the multiplayer block and allowed him to use multiplayer games. But Minecraft on iOS crashes every single time on startup trying to sign-in. My son has been crying for hour, great job Mojang! Thanks for ruining my evening,