Running SSPR on Win2012R2

Baffled by inability to change passwords on a small subset of users in
AD. Help Desk currently using SSPR successfully to change passwords on
vast majority of users in our directory. I'm hoping I've got the
blinders on and am missing something obvious but am stumped at this

When attempting pw change from HelpDesk module, the target user
successfully shows the correct profile in "Password Policy." That
specific policy contains default values.

Attempting to change the password returns:

"New password does not meet rule requirements


Reviewing the log at trace level does not reveal anything when searching
for "undefined"

I'm happy to paste the log of the trace here or on onedrive if it is
safe to do so (the log file, not the config file which I realize
contains credentials)

Any suggestions how to troubleshoot this further?

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