Sharing calendar - which was allowed - no longer is..everyone given owner access..

Outlook 365 not giving permissions. A user is trying to share a calendar. She has given Owner status to everyone...however she is now getting this message. see attached file. She said she has shared no problem in the past...
EE_Outlook_permissions.png
LVL 1
agwalshAsked:
Who is Participating?
 
ITguy565Commented:
Please review the following article :

https://support.microsoft.com/en-us/help/3187524/policy-does-not-allow-granting-permissions-at-this-level-to-one-or-mor

SOLUTION

To resolve this problem, follow these steps:

Do one of the following, as appropriate for your situation:

Connect to Exchange Online by using Remote PowerShell. For more information, see Connect to Exchange Online using Remote PowerShell.
On the on-premises server, open the Exchange Management Shell.
Determine the sharing policy that's assigned to the user. To do this, run the following command and note the policy returned:
Get-Mailbox User1 | fl *sharing*
Update the sharing policy for the user. To do this, follow these steps:

Open the Exchange admin center.
Click Organization, and then double-click the policy that's assigned to the user under Individual Sharing. This is the policy that was returned in step 2.
On the Sharing Rule page, select the calendar sharing level that you want to allow under Specify what information you want to share, and then click Save.
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agwalshAuthor Commented:
Should solve it but probably solution one for the IT department rather than a regular use.
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