[D] Accepted ICCV25 workshop paper somehow never made it into proceedings

A paper from our group was accepted to an ICCV25 workshop. Copyright transfer was completed, registration was completed, and the paper was presented at the workshop. In 2026 March (by random chance) we found out that it never appeared in the proceedings. We asked the ICCV workshop group about it, and they simply stated that the paper had been removed because it was “not registered.” But it was registered, and we have documentation for that. No explanation was given beyond that. We still do not know what happened or whether anything can still be done.

Has anyone dealt with something like this before? Who actually has the authority to resolve it, the workshop organizers, the main conference, CVF, IEEE/CPS or someone else? And is there any formal way to escalate it?