FeatureLockDown not working in Reader

Acrobat Reader DC ("Continuous Release | Version 2018.011.20040") doesn't seem to respect any of the "FeatureLockDown" policy settings in the registry. After trying to find the right magic sauce for a while, I ran process monitor and it doesn't even appear to be querying for those values. Is there something that has to be done to make that work?

None of these have any effect:

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Adobe Acrobat\DC\FeatureLockDown]
"bSuppressSignOut"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Adobe Acrobat\2017\FeatureLockDown]
"bSuppressSignOut"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Adobe Acrobat\2018\FeatureLockDown]
"bSuppressSignOut"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Acrobat Reader\DC\FeatureLockDown]
"bSuppressSignOut"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Acrobat Reader\2017\FeatureLockDown]
"bSuppressSignOut"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Acrobat Reader\2018\FeatureLockDown]
"bSuppressSignOut"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Policies\Adobe\Adobe Acrobat\DC\FeatureLockDown]
"bSuppressSignOut"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Policies\Adobe\Adobe Acrobat\2018\FeatureLockDown]
"bSuppressSignOut"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Policies\Adobe\Adobe Acrobat\2018\FeatureLockDown]
"bSuppressSignOut"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Policies\Adobe\Acrobat Reader\DC\FeatureLockDown]
"bSuppressSignOut"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Policies\Adobe\Acrobat Reader\2017\FeatureLockDown]
"bSuppressSignOut"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Policies\Adobe\Acrobat Reader\2018\FeatureLockDown]
"bSuppressSignOut"=dword:00000001