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I have several service profiles that were deployed from a template that in turn uses a LAN connectivity policy that includes vNICs from several vNIC templates (these are ESXi hosts). I needed to add to the VLAN list on a couple of the vNICs so I did...
Well that's embarrassing.
The vNIC template was set to an initial template, not an updating template. I Changed it to updating and the VLANs populate correctly.
Thanks for the hint!