Members of circles are shown by user id instead of display name

[susnux]

Steps to reproduce

1. Open contacts
2. Create new circle
3. Add a user
4. See the user in the members list is shown by their user id instead of display name

Expected behavior

Users are shown with their display name

Actual behavior

The user id is shown as their name (this is confusing if you use some random digits as user ids).

Server operating system

No response

Web server

None

Database engine version

None

PHP engine version

None

Nextcloud version

26.0.7 and 27.1.2

Updated from an older installed version or fresh install

Fresh install

Signing status

No response

List of activated apps

No response

Nextcloud configuration

No response

Browser

No response

Client operating system

No response

CardDAV-clients

No response

Web server error log

No response

Nextcloud log

No response

Browser log

No response

Browser log

No response

[ChristophWurst]

cc @artonge

[artonge]

Why me? I know very little about circles or users.

[ChristophWurst]

Right, my bad. Meant to ping @ArtificialOwl and @mejo- :)

[dschwerdel]

I've got the same issue. In contacts all users are shown by their Name Attribute.
(Nextcloud 29.0.4, Contacts Version 6.0.0)

But when I create a group or list the members of a group the Keycloak ID gets displayed as the Name of the group member.

Its in <div ... class="members-modal" <div role="listitem" class=""> <span ... class="option__lineone"
In most of the entries the keycloak ID is displayed.

If I switch from sub to preferred_username in config.php the keycloak Loginname is displayed.
'oidc_login_attributes' => array ( 'id' => 'preferred_username', ...

This is also not desired. For a user only the Fullname is a usable label. Just as in class="contacts-list"