Within Office365 > OneDrive.On Mac and windows (both chrome), users are starting to notice that when an external contact is entered which has been used many times before without issue, is now getting the error "The link can't be sent because at least one recipient isnt valid...unable to sendor The external email address has similar characters (first name) as an internal address, only the internal address shows up (pic2)Copy link has no issues is there a way to clear pr delete the address cache?This issue also occurs in IE, firefox and Edge thanksShane

My problem was solved after troubleshooting several items with MS support. The cause of the issue in my case was that the external email address that I was trying to share to was listed as my secondary email address for account recovery. Changing my secondary email address solved the issue for me. If that doesn't work for you, the problem may still be that the email you are trying to share to is registered in your instance of onedrive/sharepoint and you may end up having to take steps to remove it manually through powershell (which was what I almost had to do). Unfortunately I do not have the instructions on fixing via powershell, but you could try googling it as I think they are available somewhere. Otherwise call the support team. Best, MVR

See if you can remove the external user from the office 365 admin center. They will be marked with #EXT# in the username. https://support.microsoft.com/en-us/help/3026385/how-to-remove-users-from-sharepoint-online Additional notes At the Office 365 admin center level, user management lets an administrator manage users (create, delete, license, and assign delegated admins) in the Azure Active Directory domain structure. The portal also allows for the management of external users for site collections, including personal sites.

I am having the same issue. Our OneDrive admin console is set to allow anonymous sharing of URL'sYet, anytime I enter a person outside of our organization, the error is:'The link can't be shared because at least one recipient isn't valid' What is causing this?

I'm having the same issue - External sharing is set to "Most permissive" in the OneDrive admin center but users can only specify internal email addresses when sharing files and folders. Attempting to share with an external user produces "The link can't be sent because at least one recipient isn't valid". Looking at existing Microsoft documentation such as this: https://support.office.com/en-us/article/Manage-sharing-in-OneDrive-and-SharePoint-ee8b91c5-05ec-44c2-9796-78fa27ec8425?ui=en-US&rs=en-US&ad=US seems to imply that this is not expected behavior.

Olgy Gary, Robert Woods is correct. Check the O365 Admin Portal and look for a user with that e-mail address. If the user's e-mail is srice@microsoft.com, it should look something like srice_microsoft_com#EXT#@contoso.com. What is happening is that when you share, by default we pick a user who matches in your company's directory. Once removed, this should work properly. Thanks! Stephen Rice OneDrive Program Manager II

Office365 OneDrive Share - Link cant be sent to external email address

Armand Salmon
Copper Contributor
Oct 25, 2017
I am having the same issue. Our OneDrive admin console is set to allow anonymous sharing of URL's
Yet, anytime I enter a person outside of our organization, the error is:
'The link can't be shared because at least one recipient isn't valid'

What is causing this?
- Matt Raketti
  Copper Contributor
  Nov 15, 2017
  I am having the identical issue when attempting to share a OneDrive folder to a specific external email address. All permissions are properly setup to permit external sharing with users who accept the invitation and are able to authenticate their email on the MS side.
  - Peter Lundstedt
    Copper Contributor
    Dec 12, 2017
    I'm having the same issue - External sharing is set to "Most permissive" in the OneDrive admin center but users can only specify internal email addresses when sharing files and folders. Attempting to share with an external user produces "The link can't be sent because at least one recipient isn't valid".
    
    Looking at existing Microsoft documentation such as this: https://support.office.com/en-us/article/Manage-sharing-in-OneDrive-and-SharePoint-ee8b91c5-05ec-44c2-9796-78fa27ec8425?ui=en-US&rs=en-US&ad=US seems to imply that this is not expected behavior.
- candicatkins
  Copper Contributor
  Jul 16, 2020
  Armand Salmon

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Office365 OneDrive Share - Link cant be sent to external email address

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