I have a code for the Akamai imiclk iframe in which there is a value for 'did' but not 'ptid' which Tealium expects. Should I enter that value next to Ptid or should I leave it blank?

[jared_hislop]

The "ptid" config is an optional field. You can just leave it blank in this case. I believe the "ptid" value is used for transaction/order tracking.