Yes, he will be fully discharged from his obligation because he didn't receive notice of Juan's assignment to Joshua.
A discharge of obligations refers to that parties to the contract which are no longer liable for any terms and condition of the agreement, and no further promises may be enforced.
The discharge of the contract occurs when the obligations of the contract between the parties of the contract comes to an end. This often ends the legal validity of the contract. The discharge of the contract is also known as the termination of the contract.
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