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Note, it works only if you Log Work with the app dialog, instead of JIRA native dialog, or if you switch Time Tracking provider to “Timesheet Reports and Gadgets provided time tracking” or to “Time Reports provided time tracking” in Jira Settings - Issues configuration, please see https://confluence.atlassian.com/adminjiracloud/configuring-time-tracking-818578858.html#Configuringtimetracking-Changethetimetrackingprovider also.