Thank you for your support all this while. The issue is now fixed in the latest update of InDesign.
Please upgrade to the new InDesign 14.0 from your Creative Cloud Application.
If you are unable to see the update yet, click on the menu (three dots) on the top right corner of Creative cloud app and click on “Check for App Updates”.
Let us know if the issue is resolved for you in InDesign 14.0.
InDesign TeamAnonymous commented
same problem after last mojave beta update!
please help and let it run again!
give us an beta indesign fix for the beta mojave!
looks like app permissions creates a collision with the beta