Comment 3 for bug 668368

According to the upstream bug report:

"""
To my understanding, %S (== the name of the service connected to) is
appropriate here, since the user connects to a share with name equal to the
user's name, so in this special case, %S is the same as the username.
"""

So it is unclear if changing from %U to %S is actually appropriate here.
Please investigate further and re-subscribe sponsors when a more definitive solution is identified.