The API key and Device ID you have entered is incorrect.
The whole instruction is already provided in the training module - Bolt IoT Trainings
The following statement is already mentioned in the text -
You can find your device ID and API key Bolt Cloud from your Cloud dashboard.
Please go through the training module twice before posting it on the forum. It’ll help you in correcting any mistake or doubt by yourself. Debugging an issue is a prime requirement when coding a program.
Let me know if you have any other queries.