The issue reported is at Apple’s end.
Hence, Apple is recommending to update macOS to 10.15.x version in order to resolve this issue.
Please update your macOS to Catalina. If you still face this issue in macOS 10.15 do add your comment in this thread.
Adobe InDesign team
An error occurred while saving the commentSam commented
Need a resolution for this problem - (excuse the pun)