Tealium Learning Center

Hi, I have an extension that doesn't appear to be firing on some events. The extension pushes in the FB pixel some data when the following criteria are met: variable siteSection = Criteria 1 AND fbEventType = ViewContent AND variable subCategory = Criteria 2 AND variable isAO = Criteria 3 I'm fairly new to Tealium, but I can see that we can't have nested criteria here in the way I would like. Rules must in groups of AND rules only e.g. RULE 1  [ this and this and this]  or RULE 2 [ this and this and this ] rather than us having RULE 1  [ this ] and RULE 2 [ this ] and RULE 3 [this or this or this ] Anyway... my issue is that I've seen that while the first 2 criteria are met, it seems that variable subCategory doesn't always exist, nor does variable isAO. I have tried to specify some criteria stating that ruleset 1 has variable subCategory is defined AND variable subCategory = Criteria 2. (to account for when it IS present and meets the criteria), but I also then need the extension to fire when the variable is not present (as the absense of it, also should trigger the extension).  And that's where I get stuck. it seems 'is not defined' isn't working. Should I be using 'is not populated'? In this case, it's not that the variable does/doesn't have values contained, but more it is NOT PRESENT in our utag data layer. I'm hoping someone can help, Thanks so much, Rachael ... View more