Could be hard to replicate.

When user which has no tenant created is logged into server and acceses User Access it faces error: 

TypeError: Cannot read properties of null (reading 'preferredUsername')
    at https://konflux-ui.apps.stone-stg-rh01.l2vh.p1.openshiftapps.com/main.97535b81adbc270e14ee.js:1:59354
    at n (https://konflux-ui.apps.stone-stg-rh01.l2vh.p1.openshiftapps.com/vendor.8d321f0c8362af270399.js:2:2044807)
    at As (https://konflux-ui.apps.stone-stg-rh01.l2vh.p1.openshiftapps.com/main.97535b81adbc270e14ee.js:1:59567)
    at https://konflux-ui.apps.stone-stg-rh01.l2vh.p1.openshiftapps.com/main.97535b81adbc270e14ee.js:1:60987
    at u (https://konflux-ui.apps.stone-stg-rh01.l2vh.p1.openshiftapps.com/vendor.8d321f0c8362af270399.js:2:951846)
    at https://konflux-ui.apps.stone-stg-rh01.l2vh.p1.openshiftapps.com/vendor.8d321f0c8362af270399.js:2:951979
    at u (https://konflux-ui.apps.stone-stg-rh01.l2vh.p1.openshiftapps.com/vendor.8d321f0c8362af270399.js:2:952025)
    at https://konflux-ui.apps.stone-stg-rh01.l2vh.p1.openshiftapps.com/vendor.8d321f0c8362af270399.js:2:952490
    at Object.resolve (https://konflux-ui.apps.stone-stg-rh01.l2vh.p1.openshiftapps.com/vendor.8d321f0c8362af270399.js:2:952787)
    at https://konflux-ui.apps.stone-stg-rh01.l2vh.p1.openshiftapps.com/vendor.8d321f0c8362af270399.js:2:970908