Recently I encountered an error with PowerPivot Management dashboard at a client site. The error read:
We do not know what happened, but something went wrong.
Could you please try that again?
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It was a quick fix as they were missing required permission on SharePoint Admin content database.
You will need Excel Services App Pool account to have SPDataAccess permission on Admin content database.
In SharePoint 2013 when you assign permission to a user you do not want to notify them using SharePoint email notification. This could be for various reason. I am not going to discuss why given that’s not the point.
Now on assign user permission dialog “Send an Email Invitation” checkbox is partially hidden. The reason I say it’s partially hidden is because you do not see the checkbox until you click Show Options link at the bottom of the dialog.
Note: You will not see the checkbox if you have not configured outgoing email in your farm.