Hello,

I created the validation rule and checked that it worked in my org.
When I check it through trailhead, I get this error:
Challenge not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Insert failed. First exception on row 0; first error: FIELD_CUSTOM_VALIDATION_EXCEPTION, Zip Code does not match Account Shipping Zip Code: []

A different thread suggested deactivating the rule but when I do so I get this:
Challenge not yet complete... here's what's wrong: 
The validation rule failed to enforce the business logic

For reference, this is the validation rule.
(NOT (ISBLANK(Account.Name))) && (MailingPostalCode <> Account.ShippingPostalCode)
Looks good and works well. 

Any thought?