Implementers of OpenID Federation gathered at the 2026 Trust and Internet Identity Meeting Europe (TIIME) unconference in Amsterdam on Friday, February 13, 2026 to test their implementations with one another. 12 people with 9 implementations and from 9 countries performed interop tests together. Participants were from Croatia, Finland, Greece, Italy, Netherlands, Poland, Serbia, Sweden, and the US.

The interop was organized by Niels van Dijk of SURF and Davide Vaghetti of GARR. Davide ran the interop, including assembing the test federation with the participants. Giuseppe De Marco’s OpenID Federation Browser was a useful tool for visualizing and understanding the test federation. The test federation remains assembled and I’ve observed that some participants have continued to test with one another in the days since the in-person interop at TIIME.

Here’s some photos and graphics to capture the spirit of the interop.