Query Works But Same Where Condition Does Not With OpenForm

I am creating a search function to search a name. The DB stores it as [First Name] , [Last Name].... This query works

Code:
SELECT *
FROM tblVolunteers
WHERE ((([First Name] & " " & [Last Name]) Like "*bob j*"));

It will show me records for Bob Johnson, Bob James and Bob Jones....

I am trying to duplicate this with a DoCmd.OpenForm statement... Replacing the static name with a field variable...

Code:
Dim whereClause As String
whereClause = "[First Name]" & " " & "[Last Name] Like " '*" & volunteerName & "'*""
DoCmd.OpenForm "Volunteers", acNormal, , whereClause, , , False