Enabling /bin/bash on Catalina - invisible to System Preferences -> Security & Privacy -> Full Disk Access
I followed Peter Brooks' suggestion and it worked for me:

system Preferences -&gt; Security &amp; Privacy -&gt; Privacy -&gt; Full Disk Access
Click the lock in the lower left corner to allow changes
Separately, Open a finder window
Select Go -&gt; Go to Folder... from the menu bar
Type /bin and click Go.
Drag /bin/bash to the Full Disk Access (right hand side)

Done.
When I Just clicked the + in the Full Disk Access thing, i could not find /bin/bash . It somehow wasn't visible. ¯\(ツ)/¯