Hi Mhu12,
What dose “XXX” mean? Is it a Date?
It seems that when we use “Recurrence” to trigger a flow, in the action “post to my timeline on Facebook”, we can only fill a string in Status Message. When the flow run, the posted messages would be the same.
As a workaround, we can trigger the flow by clicking a button, followed by an action “post to my timeline on Facebook”. In PowerApps, add a Button and a Textbox, and configure the Text property of the Textbox to:Today(). When the button is clicked, the data in the Textbox can be posted to Facebook.
Please try to create a flow triggered by a button. If this still not works for you, please feel free to reply.
Best regards,
Mabel Mao