Discussion posts and replies are publicly visible
Check the following thread. The same issue was reported in that:
https://community.appian.com/discussions/f/data/35375/generate-record-event-type
udhayang4429 Please check your Application Administrators if you are added or not and check your record type security as well ( you have to part of the groups defined for your Record type security)
Check permissions of the app where the record is included, and also the record itself