Why are my ads not eligible to run?

Hi there,

I’m a new seller and I’ve listed my items for sale and want to run an advert to promote the brand and generate sales.
The adverts wont run as I can see a message stating that:

Your ad is not eligible for impressions because it is missing an image.
Your ad is not eligible for impressions because your listing is not in the buy box.

All my products are listed with images so I fail to see how the first line is correct. I’ve looked into how I can promote my products into the buy box when I am the only seller with these products as they are unique to me.

Please can you help me get the adverts running?

Many thanks

As a new seller you do not qualify for the buy box for 3 months - so a waste of effort running ads until post-3 months