The source – developers.google.com
Google has updated the agent string for the AdsBot Mobile Web crawler in its documentation. He recommended users to update it in the code without fail.
The new user agent string looks like this:
Mozilla/5.0 (iPhone; CPU iPhone OS 14_7_1 як Mac OS X) AppleWebKit/605.1.15 (KHTML, як Gecko) Version/14.1.2 Mobile/15E148 Safari/604.1 (compatible; AdsBot-Google-Mobile; +http /www.google.com/mobile/adsbot.html)