The runtime should revert to the identity of the application pool, but reverting to the application pool must be explicitly enabled for the service application by a farm administrator

I was trying to change the Authentication Mode of one the External Content Types (BCS) to ‘BDC Identity’ through SharePoint Designer, when this error was thrown.


The solution was to set the revert to self option of the BCS service to true. To do that, run the following in the Management Shell.

$bcsServiceApp = Get-SPServiceApplication | where {$_ -match "Business Data Connectivity Service"}
$bcsServiceApp.RevertToSelfAllowed = $true;

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