Some fixes I've used for this problem:
Check if the connection you want to share is shareable.
a. Press Win-key + r and run ncpa.cpl
b. Right click on the connection you want to share and go to properties
c. Go to sharing tab and check if sharing is enabled
Run devmgmt.msc
from the run console.
a. Expand the network adapters list
b. Right click -> properties on the adapter of the connection you want to share
c. Go to power management tab and enable allow this computer to turn off this device to save power
. Restart your laptop if you've made changes.
Check if airplane mode is disabled. You can enable airplane mode and then turn on the wi-fi, you can never know. Do disable airplane mode if it is on.
Use admin command prompt to run this command.