Here is now the key configuration item. We would like the comments posted on the JIRA Software project to be visible on the synchronised JIRA Service Desk project.
The configuration is very similar to the previous one.
In the Issues tab, set "Source issues", "Link direction" and "Target issues" as below. Remember the relevant synchronisation direction this time: JIRA Software → JIRA Service Desk.
In the Author tab, select a Synchronisation Author. This user must be a JIRA Service Desk Agent member of the Service Desk Team in the target project, so as to be able to post public comments in the JSD project.
In the Fields tab, select a fields mapping (not necessarily the same way as in the previous synchronisation).
In the Comments tab, choose "Post a Synchronisation Author" and set the comment visibility in JIRA Service Desk to Always public.
And you're done! Everything is set and your team can enjoy working in close collaboration.