disabledReason 
  For member accounts with a status of ACCEPTED_BUT_DISABLED, the reason that the member account is not enabled.
The reason can have one of the following values:
- VOLUME_TOO_HIGH- Indicates that adding the member account would cause the data volume for the behavior graph to be too high.
- VOLUME_UNKNOWN- Indicates that Detective is unable to verify the data volume for the member account. This is usually because the member account is not enrolled in Amazon GuardDuty.