I need to complete the proving grounds but it’s not showing. Again the guy I was doing them had access to the playlist but there is nothing next to my GM icon

I see the issue. My apologies for not fully understanding the situation. You need to first obtain the conquer seal and then the make up node will be present. After which the make up node will become available for you to use and should show all 6 GMs for the season. Once unlocked, you will lose the ability to launch GMs through this node once completed them. This node is meant to make it quicker for people to gild their Conqueror seal.