we need to reset out system administrator account from the backend as current user who using this is no longer with the organization.
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For an on premises installation, consider: https://docs.appian.com/suite/help/19.4/Quick_Start_Installation_Guide.html#part-eight-update-password-properties-file
For cloud, contact support.
Hi manojm0002
If the user is no longer with the organization, you can deactivate his account from admin console