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Raghvendra Jha 14Raghvendra Jha 14 

ANT and Data loader is not working when MFA is enabled.

multifactor authentication is mandatory for amdin user. When I enable this feature for admin then not able to deploy code using ANT  and i unable to login  in data loader using password authentication.
VinayVinay (Salesforce Developers) 
Hi Raghavendra,

For developer tools that use API logins, users log in with a security token or TOTP instead of Salesforce Authenticator when multi-factor authentication is enabled.

Check below References:
https://help.salesforce.com/articleView?id=000314598&type=1&mode=1
https://help.salesforce.com/articleView?id=sf.security_require_2fa_api.htm&type=5

Thanks,