Git issue: https://git.knut.univention.de/univention/dev/education/ucsschool-kelvin-rest-api/-/issues/162
Fix released: https://docs.software-univention.de/ucsschool-kelvin-rest-api/changelog.html#v3-1-1-2025-10-07 This release will fix a issue that had been introduced in Kelvin 3.0.0 and prevented the removal of e-mail addresses in case a schema was defined.
As already mentioned, Kelvin 3.1.1 has been released.