Users may be unable to set a password if prompted for MFA during a password reset. This occurs when the registered MFA method is unavailable.
If you cannot set a new password because you are prompted for Multi-Factor Authentication (MFA) during a password reset, contact a system administrator to disconnect your MFA and then reset your password.
A system administrator who can log in must perform the following steps:
Contact a system administrator to disconnect the user's MFA.
Perform a password reset.
This allows the user to set a new password without being prompted for MFA.
Users with a Salesforce license and the Manage MFA in User Interface permission can disconnect MFA.
If no system administrators can log in to the organization, contact Salesforce Support.
Sales Service Cloud : How to Disconnect a User's Multi-Factor Authentication (MFA)
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