Freeze in the Minecraft screen and it dont let me in.

When I select the game, it shows me the mojang screen and then the minecraft screen with the grey bar and it freezes. It doesn’t charge and it don’t let me play. Some days ago I installed the Microsoft account to play online. Everything worked fine but suddenly stopped working. I tried to turn off my mini Ipad but it doesn’t work. Pleasd help me with this bug, i love playing minecraft.