For folks updating today: In macOS Sequoia you will see this prompt:
Tumult Hype requires these permissions to preview your Tumult Hype in Hype Reflect over your local network. If you hit 'Don't Allow', Hype won't discover your mobile device for this preview. To grant permissions to Hype if you hit 'Don't Allow', Visit System Settings > Privacy & Security > Local Network and toggle the checkbox for Hype.