Logging In With a Username – Flickr Help Center
https://www.flickrhelp.com/hc/en-us/articles/4404079547668-Logging-In-With-a-Username
webUsing our new login system, you’ll need to use an email address to sign in-- no longer a Yahoo ID or username. Not sure which email address you signed up with? If you previously signed in to Flickr with only a Yahoo ID or username, try adding @yahoo.com (or @yahoo.co.uk, @yahoo.co.jp, etc. depending on your location) after your username.
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