I'm trying to use people.searchDirectoryPeople API to get photos from people in my organization. According to the documentation, I should have the https://www.googleapis.com/auth/directory.readonly access token, which I have provided. But results are missing the photos array ( according to the documentation there should be a photos array for each one of the results). I've set the mask to photos. If I set it to emailAddresses,photos It will return the emailAddresses array but not the photos. I can't find what I'm missing here, is there any specific scope that I should add or some other parameter.

P.S: I've added the https://www.googleapis.com/auth/userinfo.profile scope too, but no luck. Any idea where I should continue looking/investigating?
Thanks!