Session in wordpress

Hello!

We have a small internal corporate interface in which we share articles between writers.

After posting articles in this interface, the user submits a POST with title and content to our wordpress site to the page /wp-admin/post-new.php.
Each time a POST is sent, the user has to log in again.
Please help me! How to fix a user session in wordpress for a long time?

I already tried to change php.ini variables and “auth_cookie_expiration” wordpress filter.

Thank you!