Connecting to blynk.cloud:443 - Secure connection failed

It would be useful to see your entire serial output from boot-up, and to see what was shown in the serial monitor during the provisioning process.

You haven’t uncommented a board type, so do the custom board settings in Settings.h match the GPIOs on your particular board?

You should read the “Defining your physical switch and LED” section of this tutorial for more info…

You will then be able to clear the provisioned credentials by pressing the physical switch for 10 seconds, and re-provision the board then post the serial output that results from that process.

Pete.