I'm working on the Data Security trail and attempting to check the challenge for "Controlling Access to Objects"

The challenge requires a profile to be created with the following traits:
    Name: Account Reviewer
    Salesforce license type
    Only read access to Account object. (And no access to any other object in the Org)

I've set the object access to readonly for Accounts, and removed all other objects.

When I check the challenge the error:
Challenge not yet complete ... here's what's wrong:
The 'Account Reviewer' profile does not work as expected.

Any suggestions on how to troubleshoot this?
I looks straightforward, is the challenge looking at anything other than data objects?

Thanks