Grub Boot Loader error when installing Kali Linux on MacBook Pro

• I am trying to install Kali Linux on an external hard drive. I am using a 13" 2019 MacBook Pro running on Catalina. Everything works smoothly during the installation process until I get to the Grub Boot loader Installation part.
• I received the following errors during the installation:
  
  ?Executing ?grub-install dummy? failed. This is a fatal error.?
  
  I press continue?
  
  ?No boot loader has been installed, either because you chose not to or because your specific architecture doesn?t support a boot loader yet. You will need to boot manually with the /vmlinuz kernel on partition /dev/sdd3 and root-/dev/sdd3 quiet passed as a kernel argument."

• The installation then finishes and boots to Mac OS.

• Does anyone have a clue what this actually means and what can I do to make it work?

• Here is the output of
  Code:

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  diskutil list

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Attachment 4826

• Here is the output of
  Code:

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  fdisk -l

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Attachment 4824

• I have tried installing rEFInd. Here is the output of
  Code:

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  ./refind-install

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Attachment 4825

• I used balenaEtcher for preparation of my USB stick.