flickriosyahoo
My Flickr account credentials do not work in the Settings app on my iPad mini retina with iOS 7. Every time I enter my Yahoo username and password I get the following message:
"Could not communicate with the server."
I have enabled two-factor authentication on this account.
I attempted to use my password, temporary access code, and even generated an application-specific password in my Yahoo account. All methods fail to sign in.
http://www.malarkeysoftware.com/projects_PhotoGrabbr.html
This great piece of software will do it.
Beware though, if don't have a pro account, you can't download the high resolution originals.
You can also do this natively with iPhoto, although FlickrExport by Connected Flow does offer some additional features. If you go to Preferences - Accounts you can add your Flickr account and it will allow you to share your photos and albums natively.
Best Answer
I just had exactly the same problem and tried contacting support. Finally the only thing that let me login was turning off two-step authentication completely.