Hi @igo
The user biography is a permission driven setting which can be enabled or disabled by user from My Settings -> Preferences -> Privacy -> Show private information to URL: (/t5/user/myprofilepage/tab/user-preferences:privacy) Please see the attached screenshot for your reference. You need to set it to "All" in order to see it for non-admin users as well.
If you need to show it in all conditions (non-admin users) consider using restadmin calls to fetch the user biography in your customization. Though it is not recommended to use excesive Restadmin calls as it effects the performance of the application and can cause security vulnerability.
Thanks
