If you’re having trouble connecting to a Wifi network, forgetting and readding it is often a common fix.

1. Go to Start > Settings > Network & Internet (left hand menu)
2. Select Wifi (big button) > Manage known networks (big button)
3. Find all mentions of the network you want to remove/forget in the list, and click Forget against each one
4. Restart your machine
5. Connec to the Wifi network again using the usual process – ensure you have the right details to do this E.g. if using a phone hotspot check on your iPhone in Settings > Personal Hotspot > Wifi Password