If you set multifactor authentication (MFA) as Optional per user in the Server Settings, you then need to configure which MFA method to use for each user.
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In Administration – Users, edit the user for whom you want to configure the MFA.
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In the Multifactor section, select the MFA Type from the list.

Multifactor – Type  - 
You now have two choices. Either:
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Check Configure later by user to let the user configure their MFA by themselves when they next connect to Devolutions Server.

Configure later by user  
or
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Follow the steps to configure the MFA for the user.

Configuration steps  
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Click Update to save your changes for this user.
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Repeat the steps for each user.
 
MFA settings in Devolutions Server can be modified without administrator rights or approval in Preference – Multi-factor.