Yeah, I would say Client Care is probably the best bet here... they should have access to more backend logs to drill right into the issue you are encountering...    Good Luck!

This is my understanding as well... I think this is also why when you want to delete something, you need to disable it first and deploy, only then can you delete... Launch will prevent you from deleting anything that is in the Upstream Builds...   If the disabling is temporary, then leaving it there...

Can you find any pattern to where the MCMID is missing from the URLs? Maybe coming from specific domains, or using specific OS/Browsers/etc. Anything you can find to try and do manual testing to try and replicate the scenario where it fails?   Do any of your sites have Cookie Opt-In/Out that you are...

I would highly recommend that you keep your Internal Campaigns separate from your External Campaigns (including not counting your internal Campaigns in your Marketing Channels).   Also, if you are tracking on the actual click of the banner, you technically don't need to pass a query string campaign ...

Yes, once you identify the event # for the "Instance" event, that corresponds to your eVar, you can use that in your SQL to find the instance.   Keeping in mind, that the instance will trigger if the same value is set to the eVar in a row:   Page 1 - eVar1 = "X"Page 2 - eVar1 = "X"Page 3 - eVar1 = "...

Glad you figured it out... and hopefully if it was your VPN, that your IT department can fix that quickly... you don't want to be logging in and out of VPN all day to do your job.... 

If you check all the tabs that aren't greyed out, can you see if there is anything flagged as being missing?   When I check mine, as soon as I choose an account and location, "Save" becomes available.. so it's odd that it's still greyed out for you.... 

Yeah, this was what I was thinking too... use Launch to listen for and push a replication of the data layer... If they have access to Launch... rather than trying to do this with custom code in GTM.   in fact the "push through to GTM Data Layer" could be done in the existing Adobe Rules as secondary...

Ah, yeah, this complicates matters... what all do you have access to? You mentioned the agency responsible for the Adobe side is unable to support at this time.. is that just the coding for the Data Layer? Do you have access to Launch to make changes, or is that outside of your control too?   Given ...

events_list is a comma separated list of all the metrics that were triggered for a hit.   With your Raw Data feed, you should get an events.tsv file that shows you the mapping: 1 Purchase2 Product View10 Cart Open11 Checkout12 Cart Add13 Cart Remove14 Cart View20 Campaign View100 Instance of eVar110...