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All I get is Untitled.Extension or just the file name with no date/time. Bug I guess.
This is a known problem and was not fixed in the latest release. This is not the only issue with the rename templates. See the following thread with links to other issues such as tokens will insert only at the end and not at the cursor location.
Please add your me-too vote, your configuration info, and details of your issue to this bug report in the official Adobe feedback forum: Lightroom: Missing example : of how filename is to be named/created in filename template editor (how it will look BEFORE… . That will make it a little more likely Adobe might prioritize a fix, and you'll be notified immediately when the status of the bug changes.