Conflict with EE4 Event Mobile Apps

Hello Dears,

I have Event Espresso 4 who work fine on my website.

Yet I add EE4 Event Mobile Apps on my mobile to do the connection.
(https://eventespresso.com/wiki/ee4-event-apps/)

When iThemes Security is activated I have the following error
“Connection error. Unable to load data”

When iThemes Security is disabled Mobile App work fine ??

I think I must disabled a parameter who does not allow connection but which one ?
Any idea ?

Thank you very much for your help !
Kind regards