Unable to join world on cross platform & normal platform

My friend has a nintendo switch & I have a ps4 we send each other a invite but everytime we try to get connected with each other it doesn't let us it always appear "Unable to join world" & it does the same thing with a another ps4 is not just crossplay I can only play with a friend on the ps4 in Editions I dont know if is the servers or I dont know i just want to play with my friends. So pls fix this I would be so greatful! thank u very much! <3