Newbie Question : NRF52840-DK

Hi Guys, I am following the numbers and tutorials and setting up Visual Studio on a windows PC and installing the Nordic extensions. I get as far as a successful build but I am unable to flash the build to the DK. [Blinky demo app] I get the following error pop up : "failed due to protection on the device. Do you wish to recover the device and reflash? Note: this will erase the flash memory on the device." Erasing and resetting do not seem to help. I am sure there is a config option or tick box somewhere, or even a link on the DK itself but I can't find it.

Can I please get some help to progress this issue.

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