I can't enter my friend's world in the realm from today

Around 4 o'clock this morning,  Maintenance was done at Minecraft in Japan.

After that, I couldn't enter my friend's world

The app always stopped with words about 《Building Land.

I re-entered the app, exited my friend's world and was invited again, but I couldn't.

I wondered if there was enough space, so I reduced the capacity and image quality, but I couldn't put it in the app.

 

Please teach me;(