In place OS upgrade of Skype Edge server

Is it possible to do an in place OS upgrade of an Edge server? Migrating from 2015 to 2019. Our Edge is 2015 which I know will work with the 2019 Pool, but the OS on the Edge is 2012 R2 and needs to be upgraded. We were going to decommission our Edge because we switched to Zoom and just use SFB  for internal needs,  but I think mobile clients need the Edge server to join meetings. If I am wrong on this, and hope I am, then never mind.