mbed is being turned off soon, so looking at Keil Studio Cloud. (We use the online ecosystem to ease the lab and installation burden on our students).
Copied the mbed2-example-blinky project from Studio Cloud (target: NUCLEO-L031K6). Hit "Run Project". I get message saying project compiled. Then a message "mbed2-example-blinky failed to run".
So, now what?
PS: I have praised mbed to everyone I have met for 10+ years due to its ease of use and how it almost always "just works", based on my very first usage all those years ago. RIght now, Keil Studio Cloud is looking to be a horrible replacement. Get with it ARM.
There's some troubleshooting information available here: https://developer.arm.com/documentation/102497/1-5/Known-issues-and-troubleshooting/Troubleshooting. In particular, the information on connect mode "underReset" might help in this case if you've not tried already.