Your Local Services Ads account can show as active while receiving zero impressions if Google has little or no eligible demand for your services, or if your campaign is limited by settings, budget, service areas, verification, or business eligibility.
Start by checking your account and ad status, selected services, service areas, business hours, budget, and verification status. Also make sure your Google Business Profile is verified and correctly connected.
If everything looks active, compare your targeting with actual local search demand. A campaign can be technically active but still receive no impressions when there are few eligible searches, strong competition, or your business is not matching enough of the searches Google is evaluating.