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Power App calling Power Automate - The flow input and output schema cannot be represented in WADL

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Posted on by sasrsc

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This was working.
The flow is pretty straight forward, using DV List rows and then using the Response action to return the rows (over 5000).
You have to configure the response json schema.
I changed the flow in the response JSON schema with adding a new variable. Nothing crazy.
It now fails.

I revert to the previous version which did work and it fails.

I delete the flow from Power Apps, save, get out, get back in, still fails.
I've commented out the code that calls the flow.
Still no good.
I clear cache. Still no good.
I am not sure what to do.
The flow will run and respond with data, but now I can't add the flow to my app.
Yes, I could rebuild a new flow from scratch... but geez...

Any good ideas for troubleshooting this.
This is another frustrating first with having to deal with this.

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ronaldwalcott 3,847 Super User 2025 Season 2 on at

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What is the error message?

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sasrsc 678 on at

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I got it worked after 6 hours of playing around.
I have no idea why what I did in the end worked as I swear I did 5 hours prior.
It was related to the JSON schema.

Note: I did try anyOf instead of doing an array of types as someone somewhere had suggested that worked. That didn't seem to make any difference to me.
The schema is pretty long 30-40 variables and I'm guessing that maybe I didn't do the right combo of the "type" and the "required" fields for it to work. I'm still confused but at least it's working. I would love to see a solid YouTube "how to" on that. I'm following Matthew's blog here ...
Get A JSON Response From Power Automate
Create Power Apps Collections Over 2000 Rows With These 4 Tricks

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