ERROR_MEMBER_NOT_IN_ALIAS - 1377 (0x561)
The specified account name is not a member of the group.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_MEMBER_NOT_IN_ALIAS error code indicates that a specified account name is not part of the group or alias being referenced. This error typically arises during operations involving user or group management, such as adding or removing members from groups.
Error Details
- Error Name: ERROR_MEMBER_NOT_IN_ALIAS
- Numeric Code: 1377 (0x561)
- Short Description: The specified account name is not a member of the group.
This error suggests that an attempt was made to modify a group membership where the provided account does not exist or is not recognized within the context of the operation.
Usage Context
The ERROR_MEMBER_NOT_IN_ALIAS error can occur in various scenarios, such as:
- Attempting to add a user to a group when the user does not exist.
- Specifying an invalid username during group membership operations.
- Incorrectly referencing a group or alias that contains no members with the specified name.
Developer Interpretation
Developers should interpret this error code as indicating a failure in the operation due to an incorrect account name. This can be useful for diagnosing issues related to user or group management, ensuring that all referenced accounts and groups are correctly defined within the system.
Related Errors
- ERROR_GROUP_NOT_FOUND: The specified group does not exist.
- ERROR_USER_ACCOUNT_UNKNOWN: The specified user account is unknown.
- ERROR_ALIAS_NOT_FOUND: The specified alias does not exist.
These errors can provide additional context when troubleshooting issues related to group and user management operations.
FAQ
Q: What causes the ERROR_MEMBER_NOT_IN_ALIAS error?
A: This error typically occurs when an invalid account name is used in a group membership operation, such as adding or removing members from a group. Ensure that all referenced accounts and groups are correctly defined within the system.
Q: How can I resolve this issue?
A: Verify that the account names being used in operations are correct and exist within the system. Check for typos and ensure that the group or alias is properly configured to include the intended members.
Summary
The ERROR_MEMBER_NOT_IN_ALIAS error code (1377, 0x561) indicates a failure due to an invalid account name in a group membership operation. Developers should use this information for diagnosing and resolving issues related to user or group management within the system.