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Malaka SilvaMalaka Silva 

Blocked App Customization Specialist badge

Challenge Not yet complete... here's what's wrong:
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: LBKCYITN
ShirishaShirisha (Salesforce Developers) 
Hi Malaka,

Greetings!

I would suggest you to try this with the new playground or DE org,If you still see the sam behavior then there is an appropriate team who can help you with this issue as we do not have access to this error code that you have mentioned here.

I would request you to reach out to the trailhead support here (https://trailhead.salesforce.com/help?support=home).

Kindly let me know if it helps you and close your query by marking it as best answer so that it can help others in the future.

Warm Regards,
Shirisha Pathuri
Malaka SilvaMalaka Silva
Thank you for your reply.
Yes getting the same error in the second environment as well. Created a support case.