My inbox custom tile showing error

[FR_Fujita]

Hello experts!

I have been attempting to create a custom tile for "My Inbox" app in order to expand the number of items shown on the list.

Referring to the below Help portal and SAP note, I added a parameter "ListSize" with a value "500" to the target mapping for my inbox but I get the configuration error when trying to open the My Inbox tile.

Could you advise me on how this can be properly done?

(https://help.sap.com/docs/SAP_S4HANA_CLOUD/a630d57fc5004c6383e7a81efee7a8bb/865dddc8717e408f91209697...)

(SNOTE 2995823)

The new parameter added.

Thank you in advance.

Fujita