Is 'Key' the bound column in the Combo box? If not then you need to need to change your code to something like:
DoCmd.OpenForm "intakeall",,,"[key] = " & Me!combo11.Column(x)
Where x is the column that has the 'Key' value you in it and remember that Combo boxes are 0 (zero) based so the first column is 0 not 1