ERROR_INVALID_MEMBER - 1388 (0x56C)
A new member could not be added to a local group because the member has the wrong account type.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_INVALID_MEMBER error code, with the numeric value of 1388 and the hexadecimal representation of 0x56C, indicates that an attempt to add a new member to a local group failed due to the member having an inappropriate account type.
Error Details
This error is specific to operations involving local groups in Windows. It suggests that the system encountered a situation where the account being added did not meet the required criteria for membership within the specified group. The account type may be incompatible with the group's requirements, such as attempting to add a user account when only service accounts are allowed.
Usage Context
This error typically occurs during operations related to local group management, specifically when adding new members to groups using APIs or command-line tools like net localgroup or through administrative interfaces. It is important for developers and administrators to ensure that the correct account types are used when managing group membership.
Developer Interpretation
When encountering this error, it indicates a mismatch between the expected account type and the actual account being added. Developers should verify the account type of the member before attempting to add it to the group. This can be done by checking the AccountType property of the user or service account object.
Related Errors
- ERROR_GROUP_NOT_FOUND (1306, 0x52A): The specified local group does not exist.
- ERROR_MEMBER_IN_ALIAS (1389, 0x571): A member is being added to an alias that already contains the same member.
FAQ
Q: What causes ERROR_INVALID_MEMBER?
A: This error occurs when attempting to add a member with an inappropriate account type to a local group. Ensure that the account being added meets the requirements of the group.
Q: How can I resolve this issue?
A: Verify the account type before adding it to the group. Use appropriate account types as defined by your organization's policies and ensure compatibility with the group membership rules.
Summary
The ERROR_INVALID_MEMBER error code is specific to local group management operations in Windows, indicating an inappropriate account type for a member being added. Developers should carefully validate account types before performing such operations to avoid this error.