Keep awake needs SuperMirror allowed in the background
SuperMirror needs background permission to keep your Mac awake with the lid closed.
Try these in order
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Open Login Items
In SuperMirror, click Open Login Items. Or open System Settings → General → Login Items & Extensions. On some macOS versions, the page is called Login Items.
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Allow SuperMirror in the background
Find SuperMirror under Allow in the Background and turn it on. Approve the macOS prompt if asked.
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Return to SuperMirror
Check that the permission message clears. Then enable Clamshell mode and check the tablet with the lid open first.
Still stuck?
Email [email protected] and describe what you see.
Include your tablet model and the message in SuperMirror. The Logs button in the Mac menu copies a report you can paste.SuperMirror for Mac · All connection checks