First, my answer is going to assume you are referencing ads displayed on the ATM screen rather than an ad on the side/top of the physical ATM.
Unfortunately, the rules don't clearly address ATM screens and I think you may even find mixed opinions regarding what is correct. Therefore, the conservative approach would be to only include fully compliance ads on your ATM screens. That said, I could see an argument for using the indoor sign exemption if the ATM is physically located inside your branch - if it is outside of the physical branch (such in a drive through lane), it would not clearly not qualify IMHO.
From the commentary:
"1. General. Indoor signs include advertisements displayed on computer screens, banners, preprinted posters, and chalk or peg boards. Any advertisement inside the premises that can be retained by a consumer (such as a brochure or a printout from a computer) is not an indoor sign."
_________________________
Adam Witmer, CRCM
All statements are my opinion, not those of my employer, and should not be taken as legal advice.
www.compliancecohort.com