Confused by Rockshox damper

I have a set of 150mm revelations but they won't lock out, they are 2016 solo air RL.
The cap says Motion Control DNA Compression with a picture of a padlock, they are working as intended and the damper doesn't lockout or they are currently broken?
"Adjustments: External Rebound, Lockout Threshold - Low Speed Compression to Lock, Air pressure via common Schrader valve"
I am guessing by the spec of "compression to lock" that it should lockout.
The cap says Motion Control DNA Compression with a picture of a padlock, they are working as intended and the damper doesn't lockout or they are currently broken?
"Adjustments: External Rebound, Lockout Threshold - Low Speed Compression to Lock, Air pressure via common Schrader valve"
I am guessing by the spec of "compression to lock" that it should lockout.
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I wasn't sure if the damper/cap was broken or working as it was meant to.
Working as intended = never meant to lockout.
It does firm up quite a bit when the dial is used.