It is essential to reduce all barriers to entry so that technical reasons can no longer be used as an excuse. Have you thought about:
Install the link to the platform on the company intranet or on the collaborative portal.
Save the platform access link in the favorites of all computers
Propose the platform access icon in the desktop shortcuts of each workstation
Enable SSO (Single-Sign-On) to allow direct authentication without having to enter your password (Enterprise feature)
Synchronize with the company directory to offer pre-filled profiles to accelerate the arrival on the platform (Enterprise feature)
Check that each user is browsing an up-to-date browser (sometimes, necessary update on all workstations)
Make Elium the home page that opens when the browser opens every morning