Game not appearing in launcher

Just redownloaded minecraft after having been without for over a year now. Was able to change my skin in the launcher using my Mojang account that I originally bought the game with but cannot play the game. When I switched to my microsoft account, which does not own the game, I was only presented with a buy minecraft button.

Would like to play the game that was purchased several years ago, but launcher had an issue and will not load it.