Hi,
before an update to Vault 2022 the (non configuable) displayname of a user is the same as the loginname.
After an update the configurable displayname of the user is taken from given name and last name.
So in case the loginname before the update was "mm" the user information in Vault and perhaps in a titleblock is "mm".
After the Update this information is "Max Mustermann".
Please copy the display name from the login name.
Please give us an easy way to do this after the fact. Not manually for each user individually.
