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TPS65988: TPS65988 issue

Part Number: TPS65988
Hi Team
    When the port of TPS65988 is in DFP state and has entered DP Alt Mode, customer send "AMEx" naming to TPS65988 through MCU, but 65988 refuses to execute AMEx.
What are the possible reasons why 65988 refuses to accept the naming? Note: The 65988 can be executed normally when the MCU sends other commands such as "SSrC".