I am not able to connect hotspot for other devices through iphone11

If you are not able to see your iPhone’s hotspot SSID on other WiFi devices (so that they might connect to the iPhone’s hotspot) …

… try “cycling” the hotspot on/off and/or changing the hotspot’s password.

Beyond that, you’ll need to contact your mobile carrier as “Hotspot” is one of their services.

I am using an iPhone 11 with an iPad 9, an iMac 2017 and an M1 MacBook Air. I turned on cellular data (Settings/Cellular/cellular data) and it allowed me to connect. On the iMac, for some weird reason, I have to go to Settings/Network/Ethernet and make that connection inactive for the hotspot connection to work. I'm figuring that your carrier authorized the hotspot on your account and you can see it under Settings/Cellular/personal hotspot.