Removing and re-installing TurboTax 2021 solved my problem of TurboTax not staying opening on my mac. It would open, but then close within 1 or 2 sec.
Remove your current TurboTax file in your Applications folder, and all TurboTax files in in the user ~/Library. Then empty the Trash and Restart before you re-install.
See https://ttlc.intuit.com/questions/1901210-remove-uninstall-turbotax-for-mac
The TurboTax files are in the user's library (typically Your_Name/Library or ~/Library) and not the system library (Macintosh/Library). I was unable to find the TurboTax files in my ~/Library until I realized that they were hidden files on my mac. If I did a Search for "TurboTax" in my ~/Library, nothing came up. Do a [Command + Shift + .] with ~/Library displayed to see the hidden files. Then you can delete them. Good Luck.
I spent uncounted hours trying to get TurboTax to work including 2 lengthy sessions with their IT help. Nothing they suggested helped. In the end, it was worth it since I have always found TurboTax to be excellent.
