Have you installed PurpleAds correctly? Make sure the PurpleAds snippet is correctly installed.
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Do you have an AdBlock enabled? Make sure to turn it off.
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Is your website active on your Publisher dashboard?
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Another common reason is that there are no ads in your country/region. (e.g. you're from Pakistan, and there are no advertisers targeting Pakistan). In this case, you have nothing to worry about. You can always use VPN to visit your website from the US).
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Advertisers has the option to block publishers from showing their ads.