Users who activated MFA are unable to login to Teamleader at the moment. We are investigating this issue as we speak.
If you are affected by this, the support team can disable the MFA for you. After that, you will be able to login again.
You can contact us via the following link: https://support.teamleader.eu/en/support/tickets/new
We are sorry for any inconvenience this may cause you and we will come back with an update as soon as possible.