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Doria Hamelryk VetranoDoria Hamelryk Vetrano 

lightning XP rollout specialist - Step 8 failed with error

Hi Team,
I completed the requirements for the step 8, but when validating, I get the followin error :

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: GQTZPYZA

I tried with a new org, but still the same.
I retried, validating step by step to see where it's blocking exactly :
* Activating Knowledge : pass
* Creating fields : pass
* Creating layouts : failed => from this step, I got the error

I really don't want to retake the whole challenge :(
Could someone from the Trailhead team identify the error for me ?
Thanks a lot !
Doria Hamelryk VetranoDoria Hamelryk Vetrano
Note : I did not complete the App & Homepage requirements - I firdt made it but deleted them to check if there was a link between errors and app/homepage