Help Hotspot not working

[Hotspot problems]

Every time I attempt to turn on my hotspot, it turns off straight away. Then, it will continue quickly turning on and off again for quite some time before saying (underneath 'portable Wi-Fi hotspot) 'error'. Can anyone help? The phone is a Nexus 5 on Android 6.0

 

[lunatic59]

Has it ever worked?

My guess would be that it's trying to verify with your carrier that you have a plan that allows hotspots to be enabled and it either can't verify or you don't have the right plan.