Reset Network Settings: Settings > General > Reset, then tap Reset Network Settings. Change the name of your iPhone: Settings > General > About > Name. Restart the broadcasting iOS device your iPhone. You may need to work with the manufacturer of these devices to do so. Install any and all updates that may be available for the connecting devices your PC and Sony Smart TV. Update your carrier settings on your iPhone or iPad - Apple Support
If the issue resolves after a particular step, you do not need to complete the remaining steps listed: Be sure you are testing your Personal Hotspot after each step. I appreciate all of the details you've provided, and the steps you've taken so far. Thank you for using the Apple Support Communities! Based on the details you've shared, you are unable to use your Personal Hotspot since iOS 13 update.
