Unfortunately, linking multiple users to the same account is not possible at this time.
We are, however, aware that there is strong demand for such a feature. We hope to complete its development this year so we can start offering it.
At this moment, the only solution is to share the log-in details of the account, so that multiple colleagues can log in to the account.
See for more information about setting up your Mollie account: How do I sign up for Mollie?