There are several reasons why your Windows 10 computer might not be able to detect your iPhone hotspot. Here are some possible solutions to try:

1. Restart your iPhone and computer: Sometimes, simply restarting your devices can help resolve connectivity issues. Try turning off your iPhone hotspot and restarting both your iPhone and computer, then turn on the hotspot again and see if it’s detected.
2. Check your Wi-Fi settings: Make sure that Wi-Fi is turned on and that your iPhone hotspot is enabled. Also, check that your computer’s Wi-Fi is turned on and that it’s connected to the correct Wi-Fi network. If you have connected your computer to a different Wi-Fi network, it might not detect your iPhone hotspot.
3. Update your drivers: Make sure that your computer’s wireless network adapter drivers are up-to-date. You can do this by going to the Device Manager and checking for any updates.
4. Forget and reconnect: You can try forgetting the Wi-Fi network on your Windows 10 computer and then reconnecting to it. To do this, go to the Wi-Fi settings on your computer, find your iPhone hotspot in the list of available networks, click on it, and then click on “Forget”. Then, reconnect to your iPhone hotspot by entering the password again.
5. Disable and enable network adapter: Go to the device manager and locate your network adapter. Right-click on it and select “Disable device”, wait a few seconds and then right-click again and select “Enable device”.
6. Reset network settings: On your iPhone, go to “Settings” > “General” > “Reset” > “Reset Network Settings”. This will reset all network settings to their defaults, including your Wi-Fi password, so make sure you have it handy to reconnect your computer.

If none of these solutions work, you can try contacting Apple or Microsoft support for further assistance.