flickr-gallery plugin can't generate token

Out of all the flickr plugin’s, this seems to be the best I have seen, and I have it 90% setup. The problem is it’s only showing my public pictures where I have 40+ private ones I want to show behind a WP login. I am simply missing the token. I have followed this old thread https://www.ads-software.com/support/topic/plugin-flickr-gallery-unable-to-generate-auth-token but the problem is not resolved.

I have the callback URL specified, and the secret and public API key, but when I hit the [generate] link to get the token I simply get an error saying it’s not redirecting properly (FF) or a blank white page (chrome) and the URL is simply;
https://www.mydomain.com/wp-admin/?frob=72157630501373616-7e496059a7d2e74a-77596628

The help thread above said the link would change from generate which is didn’t, and using that frob at the auth URL https://www.flickr.com/services/api/explore/flickr.auth.getToken I simply get an invalid frob (note I tried each, all 3, etc.)

So any help getting this problem resolved is appreciated.