What might these multiple reasons be? Consider a situation where your campaign has met its daily budget, causing your ad to stop showing for the day. Additionally, the specific keyword might be inactive for search. You'll now be able to learn about these multiple issues immediately so you can adjust your budget settings and modify the keyword based on the Ads Diagnostic Tool results.
You can start using the Ads Diagnostic Tool now by pointing your mouse at the magnifying glass icon next to an individual keyword in your ad group or by going to your account's 'Tools' page.
