Hi @jviernes ,
Could you please share a bit more about your issue?
Do you mean that the event created through the "Create Calendar Event" action in your flow could not be displayed in your actual Calendar List?
Based on the flow that you mentioned, I think there is something wrong with it. I also have made a test on my side, and don't have the issue that you mentioned.
The flow's configuration as below:

The flow run successfully as below:

Then go to the Calendar List, refresh the web page, the created event shows well as below:

On your side, please make sure your flow has been executed successfully. Then go to your Calendar List, refresh the web page, check if the event shows up.
In addition, please also check if you have specified proper Calendar List within the List Name field of your "Create Calendar Event" action in your flow.
If you want to see the created event within your app in real time, you could consider add a Timer control in your app, then set the Duration property to following:
1000 // fresh data source every second
set the AutoStart and Repeat property to following:
true
set the OnTimerEnd property to following:
Refresh('Your Calendar List')
Best regards,