After running the command “ALTER FEATURE FLAG "Bucketing" ON;” the query message window
will provide the messages: “Syntax is correct” and “Please provide a valid feature flag name”. However, the second message will appear with an X next to it:

This is limitation is caused by Command Manager in Strategy 2019+. This is also a regression as bucketing is no longer a feature flag in Strategy 2019.
If the Strategy Enterprise was updated to 2019, the Bucketing Feature Flag settings will be retained from Strategy 11.0 and prior. If the Strategy Suite is a fresh installation, the Bucketing Feature flag will be disabled by default.
A code fix was implemented in Strategy 2019 Update 2 to change the job bucketing behavior to always be on. Upgrade to this version to take advantage of the fix.