No. The 4-eyes principle remains fully enforced when multiple EU Login accounts are linked to the same mobile device. Each EU Login account linked to the EU Login mobile app is associated with a distinct Mobile Unique Device Identifier (MUDI). As a result, actions performed using different EU Login accounts remain independently identified and traceable, even when those accounts are linked to the same device.
This means that linking multiple EU Login accounts to the same mobile device does not allow a single user to bypass the 4-eyes principle by using one account to propose an action and another account to approve it.