Eric uses the Hotspot mode on his Note 8, but not every device can see the Wi-Fi connection. Leo says that there are two frequencies, 2.4GHz and 5GHz. The phone does both. So he should check on that. He should also check on the encryption he's using. His devices should at least see it, though. It sounds like SSID hiding may be turned on in the phone's hotspot settings. If it is, then he should uncheck it. He may want to take it into his carrier store.