The issue has been fixed in the latest release of InDesign – InDesign 2021.
Please update to this new version of InDesign to get the fix.
Adobe InDesign team
An error occurred while saving the commentPatricia commented
Still not fixed. I send an email at the beginning of 2020. Can’t open file in Indesign (2019 or 2020). Does not work with idml file. Why is this still not fixed!! The app Adobe Comp is great but is of no use if you can’t open files in Indesign on your desktop/laptop.
I see so much comment on the internet about this and can’t believe Adobe has still not fixed this problem.