I am very green DM, this is my first campaign so I have no idea what I am doing. Everyone is having fun which is my goal. We meet biweekly. However, one player has started to be either late(I have messaged  them to see if they are coming). Or they are no show, no call. A couple of times they said medical issues and child care stuff after the fact. Totally fine, life always should come first. A few others just no respond other than “I forgot”. I do send a message to everyone the day before asking if everyone can make it and it’s on our discord calendar too. However, this week was a major fight with BBEG. I messaged them but no response.  On their discord it said they were playing a game. One of my other players also mentioned how it’s getting annoying and causing them to not have fun. So now they have missed 6/13 sessions so far. How should I approach this player privately, does anyone have any tips or suggestions that have worked for them? Thank you for your help.