Simulate and Send Window message do not work

Good morning,

We are having an issue with the Simulate and Send Window Message properties.
The robot we are developing MUST work in the background. However, it seems that the application used does not support these features.
Is there any other alternative/solution to click, get text and type in the background??

Thank you very much,

Regards

Use send windows message and in properties - select key modifier as “alt” and try !!