Unable to complete the challenge "Create a guest administrator user and deactivate it"

Hi! I have a problem in the data security module, in the challenge of creating a guest admin.   Module link: https://trailhead.salesforce.com/en/content/learn/modules/data_security/data_security_org  After some common mistakes, I managed to complete the challenge but it still doesn't count as complete. 

You can see the message: Challenge not yet complete in Data Security Module

SUCCESS  What can I do to fix this error?