Appear offline is now available on Desktop/Web and iOS. It will be available later this month on Android. To learn more, please visit https://support.microsoft.com/office/change-your-status-in-teams-ce36ed14-6bc9-4775-a33e-6629ba4ff78e.
Unfortunately because of changing priorities, this feature was moved to the backlog. The team hopes to pick it up again in the near future.
An error occurred while saving the commentDragan Alexandru commented
Still not working as expected at the end of 2019. Had to replace transparent background with white one to reduce the ugly look.