Hi
@CU08060810-0, I have created a test flow to explain it to you by giving more context:
Here is the flow, which looks similar to your flow:

In Power Apps, when you write the code to trigger the flow, it will ask for the parameters as seen below:

So, we don't know which mapping is to be provided, as in the Power Automate flow, I have clearly mentioned email, subject and body, but in Canvas it asks me to provide text, text_1, text_2.
What I do is go to the flow and hover on the Power Apps (V2) action variables, and you'll see their logical names. See below:

Based on it in the Canvas App, do the mapping like in my case, I'll do like
1) Email - (logical name: text)
Value= senderemail@gmail.com
2) Subject- (logical name: text_2)
Value= Test Email
3) Body- (logical name: text_1)
Value: This is a testing email. How to trigger a flow from Power Apps.
So, my formula for trigger flow from Power Apps will be like this.

Then click on the button and run the flow. The flow will send an email notification to the sender email you have provided.
I hope that works for you!
If you have any further questions, let me know!
Reference: Create a canvas app that can trigger a Power Automate flow - Power Apps | Microsoft Learn
Official Microsoft Power Automate documentation - Power Automate | Microsoft Learn
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