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sai srujan 7
Challenge Not yet complete... here's what's wrong: The 'Top Volunteer Organizations' report is not sorting the correct direction.
app customization challenge 4 i have been trying so many times
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)
I hope you find the above information is helpful. If it does, please mark as Best Answer to help others too.
Regards,
Salesforce Support