When using iOS USB tethering, it is important to not be connected to the DataHub Wi-Fi at the same time, as this can cause a loopback scenario.
For example, your iPhone is connected to the Wi-Fi from the DataHub to get internet, and then you try to share your internet on your phone through USB tethering. In this situation, you should go to the iPhone Wi-Fi settings and select the DataHub Wi-Fi, then select Forget Network.
Further troubleshooting steps:
Restart the iPhone used for tethering.
Make sure the latest iOS update is installed – Failing to update your iPhone could impact performance and cause issues.
Verify that your cellular data plan allows hot spotting, as some plans may not offer this feature, which would prevent the tethering option from functioning.
Reset your iPhone Network – resetting your network can easily fix a tethering issue. To Reset your Network Settings go to Settings > General > Transfer or Reset [Device] > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.