Matomo Google Ads Conversion Export - scheduling not working


I’ve been trying to set up an automatic conversion upload to Google Ads but it constantly throws an error: “Something went wrong with the upload. Try again.”
I’ve defined alias, and everything as it should be. Looking at the data in Ads, it doesn’t look like they are sending any traffic (successfully) to the page. Could the reason be the lack of gclid? Any idea, what the possible issues could be?

Thanks a lot for your help!