Hi, I just test the code below:
<amp-ad width="750" height="429"
type="adplugg"
data-access-code="A48XXX45"
data-zone="reklama_w_artykule_amp_"
></amp-ad>(BTW it took me a lot of time to get that characters <> in your examples at the beginning and the end command data-zone and data-access-code are inproper ;-) )
Back to the point...Does it necessary to specific width and height for the ad? In non AMP ads/zone/placement there is only a maximum size for the ad required, and its works fine becouse, as I noticed this ads can resize depending on device.
With an AMP code, when I put the same size of ad, on mobile it apears to biger than screen.
I'm not sure if I made my self clear. Hope you get what I mean. If note I try to make a screen shot
The AMP spec allows for a variety of layouts for ads including fixed (which does require width and height) and responsive (which doesn't require a width and height). Please see the AMP docs here (https://amp.dev/documentation/components/amp-ad/) and here (https://amp.dev/documentation/guides-and-tutorials/learn/amp-html-layou…).