Prohibiting user to approve its own approval request

Summary:

The requirement is → User submitted DOR and it routes to the AOR representatives but the user itself is part of the AOR, is it possible to restrict the user from receiving notification instead it should route to other users in the AOR. I have used the Prohibit self-approval but the approval is not working uniformly.

Can somebody suggest recommend if you had similar requirement and what was done in order to achieve this requirement?

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