I'm getting an error, 

Challenge Not yet complete... here's what's wrong: 
The 'IsShiftVolunteer' field formula on the 'Volunteer Shift Workers' is not resulting in a check box when the logged in user is the volunteer, and unchecked when they are not.

I did check with two users and two volunteer shift worker records, and it works as expected. 

I entered the forumla as 

!ISBLANK(Volunteer__r.Id) && $User.Id = Volunteer__r.Id

I'm not sure what I'm missing here.
 

Hello, 

My trailhead wont let be beat this challenge. I says:

"Challenge Not yet complete... here's what's wrong: 
The 'Opportunity_Progress__c' formula field does not exist or is not of type 'Number'"

Heres my code:

IF( Percent_Completed__c <=  0.25, "Early", IF( Percent_Completed__c  <= 0.75, "Middle", "Late" ) )

(TODAY() -DATEVALUE(CreatedDate))/ (CloseDate-DATEVALUE(CreatedDate))

What am I doing wrong? The top formula outputs as text, bottom one is a percent

Thank you for help!