How to share an O365 Exchange Outlook 2016 Tasks folder with someone outside my organization

I would like to share a tasks folder with someone outside our organization but I get the attached error when I try.  

I've added the email address as a contact in O365 Exchange and I can select the user from the Global Address List but I'm unable to assign permissions to allow that user to view and edit the task folder.  

I found where I can add a domain to be able to share a calendar but nothing about any other folders.

It's not a cache issue, I select the user by clicking 'To:' and choosing the contact from there, not from autocomplete.  

Anyone have a solution for me?  Thanks in advance!

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Radhakrishnan RSenior Technical LeadCommented:

You can not do like that way. Instead use sharepoint link and send the link to the users whoever need access (you can upload the files and share via sharepoint).

Use this method

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computerconceptsAuthor Commented:
Thanks for commenting.  I ended up doing that very thing.
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