Hi Vlad,
Thank you for reaching out to us.
Can you confirm if you’re using your actual ad unit id when testing the ads in your phone? If yes, can you confirm if you enable the test device when testing it? We always recommend enabling test devices and using our sample ad unit id when checking the implementation of your app to avoid invalid traffic. With that, can you try our recommended way and let us know if the error still persists?
Regards,
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