"On hold" Status missing

"On hold" Status missing

Hello,
My colleagues and I are facing a weird issue: 
from one day to another, we cannot see the status "On hold" anymore in any of our projects (nor in the KANBAN, nor when we create a new task). Also, all the tickets that were "On hold" have dissapeared. 

Any idea please?

Many thanks in advance. 

BR
Ameny