Cannot Due with my Gold 4 friend as a plat 5 Please Help

These images say it all. Im plat 5, He is gold 4, we should be able to play together but we cant

https://imgur.com/Z5lz5St

https://imgur.com/2kaPxmJ

https://imgur.com/oBeVJzo

Edit we cant even play Ranked flex or 3v3 even tho we are both unranked