IMessages only sending on email

I turned my IMessages off then back on, later realising that I do have an option to start new conversations with my Apple ID email and my phone number. The issue is that when I send a message to another apple user it does not send through and shows up as a green text bubble and when I get an apple user to send me a message through IMessage it only comes through as SMS message as well. When I try to turn on my phone number in settings it has a spinning circle and i cant tick it. I’m on iPhone XS btw, someone help please!!! 😭👀