I have lightning input type is string if it is more than 10 should show an error at input level when I moved the cursor to other field please suggest me on this 
 <lightning-input type="text" label="Enter some text" max-length=10
             message-when-too-long="Max 10 characters allowed" ></lightning-input>

I don't know why, but Trailhead does not see that I've setup a user Samantha Cordero with the profile Field Sales User. I've create the Field Sales User profile, created the user Samantha Cordero, activate the user, generate a password, and logged in as the user. I even logged in as her in Salesforce 1, but I still get this message:

Here is what her user detail page:

Field Sales User profile: