Allright I have run the test as you suggested with WP Staging plugin and this are the results:
I made a staging site and enabled the theme you suggested. That was enough to get the plugin working. how should i troubleshoot now what exactly is wrong with flatsome.
Strange thing is that i just switched theme and the google ads account was automatically connected.
It looks like that switching to storefront and back to flatsome will make it work.. at lest the connection, not sure fi then everything works properly
Edit:It doesnt seem that the plugin works correctly. I alredy have a paid campaign running and it is not displaying in the overview. There is only a listing campaign. i can confirm its the same google ads ID, so same account.