Illustrator v26.0.1 will not Save, Save As to Computer or Export (macOS Monterey v12.0.1)
I have tried: 
- Full Disk Access
- Deselect Save in Background
- Uninstall and reinstall
- Fully updated
- And the rest.
                4
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Seth Chomout
    
 commented
    
  Have you figured this out? I am having the exact same issue.