The SLA definition condition script is evaluating to false, preventing attachment due to field values, user criteria, or business logic not being satisfied. (high likelihood)
The SLA definition is configured for the wrong table name or the record's table does not match the SLA's specified table. (high likelihood)
The SLA definition is inactive, disabled, or has an end date that has passed, making it unavailable for attachment. (medium likelihood)
Required fields referenced in the SLA condition script are empty, null, or contain unexpected values on the target record. (medium likelihood)
The user triggering the SLA attachment does not meet user criteria specified in the SLA definition, such as role or group membership requirements. (low likelihood)