Can't join my friend's world, she can't join mine.

Lets us join once if we make a new world, but then the joiner gets kicked out. Otherwise, it just says, unable to connect to world. Our WiFi is working and we are on the same version. Any things like this that I found on bug checker were resolved due to not enough information. My friend is on a Samsung phone, and I am on a PC. My username is PoptartSalad10, and my friend's user is SuperTea7980406 if you need it.