Error:- "Unique Key violation detected by database (Duplicate entry 'TASK0020070' for key 'task_U1')" is shown when user accesses chat queue to send the message to generate incident.Issue Chat users are unable to create an incident from the chat. Steps: Enabled the below-listed plugins ConnectConnect SupportConnect Support and Service Portal Integration End-user initiates chat using Service Portal.https://<instance>.service-now.com/$chat_support.do?queueID=b8d808c50fb1be00df6e1efae1050eedError displayed: "Unique Key violation detected by the database (Duplicate entry 'TASK0020070' for key 'task_U1')".ReleaseAny ServiceNow Release using Connect ChatCauseIn the customer instance, they had enforced uniqueness on the Task table "Number" field. From the documentation regarding the unique option: Note: While unique indexes ensure data integrity they also prevent any insert involving a duplicate number. This may cause unexpected errors during data entry." The chat_queue_entry number is inherited from Task. Baseline instances do not have this field flagged, so the default numbering is not an issue. In out of the box instance, 'Number' field is not set to 'Unique' in Task Table. The customer did not have Auto numbering defined on chat_queue_entry[ Table: Chat queue entry]. In a standard out-of-the-box instance, this is the default behavior. ResolutionRemove the enforced uniqueness on the task Number field to resolve the issue.Add a reference for chat into Number Maintenance on chat_queue_entry [ Table: Chat queue entry] For example: Go to System Definition > Number Maintenancehttps://<instance>.service-now.com/sys_number_list.do?sysparm_query=Click New.Table: Chat Queue EntryPrefix: CHATNumber: 10,000Number of Digits: 7Related LinksAuto-numbering records in a table