At the time of submitting the challenge at Step 3, I am facing this issue.

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: UADXOASV

Please help me to understand the issue is.

Thanks.

Greetings I am running into the error, when attempting to verify step 3 in the superbadge challenge. I have created everything I needed but still seem to be stuck. Any steps I need to take, hope it helps.

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: LELXAKDE