This was a brand new installation where NX Templates had not been installed
previously.
When opening NX 12.0 through Teamcenter, getting the error:
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NX Initialization Error
Validator should have existed for application Motion Template
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After installing the NX Templates, launching NX 12.0 was successfull
The error no longer came up.
Reference:
Document ID:001-7376894 - Unable to find any templates other than
Manufacturing when creating a new Item from NX Manager.
Document ID:002-7003616 - Upload NX templates thru 4Tier connection -
(correction to 001-6351699)
Will be addressed in PR:9029672