Ohhh I mistook what happened the first time.
So your flow is putting the Date value into Excel as a Date Value, meaning it will default to the mm/dd/yyyy hh/mm format since that is the standard format for All Dates. So, from what it looks like, you are getting the data you are looking for, just not in the correct format.
Since you want your data in a format besides what Excel will default Dates to, here are the steps you can take to set your own custom format for Excel
1. If you are in Desktop for the Web/Teams, Open Excel in Desktop (This can be done by clicking the Dropdown with Editing in it near the top right, and selecting 'Opex Excel In Desktop')
2. Select The Entire Column You want a Custom Format in
3. Click on the Data Type Dropdown (The Dropdown where it says 'Custom' on the 'Home' Tab).
4. Select The 'More Number Formats' Option.
5. Select Custom in the 'Category' Section of the 'Number' Tab.
6. Right Below where it says 'Type:' Insert the Code 'yyyy-mm-dd hh:mm:ss' (View Picture Below for Step 5/6)

This should set the values to the format you are looking for.
If you have any further issues, please let me know
Cheers,
jbishop