Why is "Find My Mac" still complaining about "Wake for network access" being inactive, although I just activated it?
In reality this is just a refresh issue as I as a tech-savvy user later realized. But average Mac users won't, as everywhere else on macOS you typically do not have these kind of refresh errors, but the software objects update each other quite reliably.
Step 4 in the question now shows the solution: Simply quit and then restart System Preferences. Then the status of &quot;Find My Mac&quot; in preference pane &quot;Apple ID&quot; shows updated correctly.