Leadsources not pulling through based on a UTM

Our digital marketing expert has created microsoft ads for us. He has set up the parameter utm_source=bing so that would appear as the leadsource and therefore we can see how many enquiries/bookings we have from microsoft ads.
My issue us that this leadsource is not appearing at all, he set the parameter up so that it is on every link from the ads.
Any help would be greatly appreciated.
Thank you

When you say that “leadsource is not appearing” where are you looking for this??? Inside Keap? Inside Google Analytics? Inside Google Ads???

Hi there, i am looking for this in Keap under the customer record ‘leadsource’ section.