There are parallel security mechanisms outside of Metadata in 9.4 that use the name of identities as an effective foreign key. These mechanisms will be impacted when renaming identities. If you'd like to proceed with the renaming process, can you please open a tech support track and we can work through some options to propagate the changes? If you open a track, please ask that I be included on it so we can short circuit the triage and cut to the chase.
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