An Empty Campaign Issue means a campaign is switched on but has nothing inside it that can run, so it can't show any ads. It covers Google Ads and Microsoft Ads Search campaigns, Meta Ads and LinkedIn Ads.
That means no ad groups (Google Ads and Microsoft Ads), no ad sets (Meta Ads), or no ads (LinkedIn Ads).
Fix it
Open the Issue to see which campaign it is.
In the ad platform, add what the campaign needs, or pause or remove it if you don't need it.
Back in Opteo, click Recheck, for example Recheck Google Ads.