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STM32H743ZI ST-Link USB Communciation Error

Hi, we are trialling Keil uVision MDK-ARM compiler and IDE to see if it is any better tha Atollic.

Te answer at present is a resounding no. We cannot get ST-LINK to work at all now matter what we do. In the debug page, the ST-LINK devcie is found with the correct serial number but there is always a ST-LINK USB Communication error shown. We have tried searching for this error but have found no fix yet, but have wasted quite a few hours on this.

Any help would be much appreciated.