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Android 9 device does not save network [migrated]

On an Android 9 tablet:

  1. Settings
  2. Use Wi-Fi
  3. Add network
  4. Enter an SSID, and select security None (the Wi-Fi does not require a password).
  5. Tap Save

The network is not saved and the tablet does not connect to the Wi-Fi network. The Wi-Fi network works perfectly with half a dozen or so other devices.

Could anyone shed some light on this?