I think did the EES registration today at FRA T1 at the Z/A immigration. It was done by the officer at the immigration booth. At least I think it's EES. He took my fingerprints and photo and the camera said it's for EES registration. Immigration officer didn't say or explain anything to me. He also stamped my passport. Everything took around 1 minute or so.

There was a lady in the booth next to me who went through the same thing. I think they did it because there was no queue behind us.