Hi Luca, here are two screenshots from my test (Network + Console).

As you can see, extend/?zone=175222 returns 403 Forbidden and the console logs "Zone: Zone 175222 not exist". The desktop zone (175098) loads fine in the same request.

I'm testing from Norway, could this be geo-restricted? Either way, if UK users are also hitting this 403, it would explain the missing mobile impressions.

I tested with the full tag (both 175222 + 175098, attached below). Zone 175098 (desktop) returns 200 while zone 175222 (mobile) returns 403 in the same request. I also tested with the mobile tag isolated and get the same 403.

Could the team check the zone 175222 setup on JustPremium's side?

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Reply to Sophie:

The creative itself is fine. The only problem I see is that zone 175222 on JustPremium's side is returning an error, which prevents our creative from loading at all. A new tag from us would still point to the same zone, so it wouldn't make a difference. I'll share it with some people in our team to check if they get the same error just in case, but it has nothing to do with the tag as far as I can tell.