Auto-propagation while in Sign-off mode isn't working.

In Sign-off when confirming a string my customer would like to see all repetitions of that string confirmed also. She has already checked the options in Editor > Autopropagation and I've also suggested to her to turn off track changes which is the only solution I've managed to find so far in my investigations. But that doesn't work either.

Any ideas or is this function just not possible in sign-off mode?