OOB Discuss UI action is not available for tables extended from case tableIssue The 'Discuss' UI action is not available for records on the custom table, which is extended from the OOB Case table. The 'Discuss' button is visible on the case table from case records, but not on the extended table.ReleaseAny releaseCauseMissing sys_ux_m2m_action_layout_item record for the custom table.ResolutionCreate a 'sys_ux_m2m_action_layout_item' record and enable the 'Discuss' button in the workspace for the custom table.Related LinksOther areas to check if a UI action is not visible in a workspace:KB1756084