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Lookslike PVLANs are not supported on the SRX only the EX, QFX and MX series devices.
https://pathfinder.juniper.net/feature-explorer/feature-info.html?fKey=1206&fn=Private%20VLANs%20(PVLANs)
I've found feature explorer is a good place to verify platform and version support for features in Junos.