Using All Internal Users group as an example, a user is not part of the group.
Groups have a setting that includes security profiles. Users assigned to a custom security profile are not included in groups they might normally be in.
If the group is missing an expected user, check that the user Security Profile is in the Included Security Profiles section of the group. Navigate to Admin --> Users & Groups --> Groups --> [Group].
Vault Help Documentation: Creating & Managing Groups
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