I can't break or put blocks in my friend's realm

My friend opened his realm 2 days ago and I can't play, the world doesn't load for me and I move on my screen but on my friend's screen he sees me standing in the same place, I can't break or put blocks either but on other servers yes It allows me to do it, I already uninstalled the game twice, I tried it on PC and PS4 and nothing works, does anyone know how to fix it?