Showing results for 
Search instead for 
Did you mean: 
New Member

HTTP Post with Powerapps input



We are trying to send powerapps info, using microsoft flow, to an URI.

After creating the Flow with HTTP action, we want to connect the flow to the powerapp. When doing this we receive the following error:

failed to register service <GUID>





Advocate III
Advocate III



I reported this issue on MS Flow. I do believe they haven't fix. Not only this issue.

  • No way to pass MS Flow Uri from PowerApps.(Data typemismatch and does not has convert function)
  • You cannot register your MS Flow if your MS Flow Choose value is come from PowerApp.



Thanks for reporting this. To understand better, the first issue is that you can't use "ask in powerapps" for the URI? And for the second issue, what do you mean by "Choose value"?



      Yes, last time we can't ask powerapps for URI. Look like fixed but i will test again. Let say, we would like to get value from powerapps when flow has condition. Here is sample.


Flow Register Fail



 I'm also get same error that rvanderouderaa reported error.

Does anyone now if this problem is solved?

This is actually a known issue we're trying to work out when an input from PowerApps is used directly in an condition block. You should be able to workaround it by clicking inside any other action to ask for PowerApps input, then use that "powerapps input" token inside the condition block. This will force the proper type for the input parameter (since condition inputs are untyped, powerapps client can't bind to these inputs). 

The initial problem is the unability to connect a flow with a HTTP component to a Powerapp. Is this a known issue also?


Yes, this is the same root cause. The "Body" parameter of the HTTP action is untyped, so PowerApps doesn't know how to bind to it. Theoretically, you can do the same workaround as above to force the input to a particular type (probably a string), but that's less practical for part of an HTTP payload. We have work booked to figure out a better story for these cases. 

Hi Samuel,


Is the issue resolved yet? Is there a better way to get input from PowerApps to HTTP action in flow now? 

Helpful resources

New Badges

New Solution Badges!

Check out our new profile badges recognizing authored solutions!

New Power Super Users


We are excited to announce the Power Apps Super Users!

Power Apps Community Call

Power Apps Community Call: February

Did you miss the call? Check out the Power Apps Community Call here.

Microsoft Ignite

Microsoft Ignite

Join digitally, March 2–4, 2021 to explore new tech that's ready to implement. Experience the keynote in mixed reality through AltspaceVR!

Top Solution Authors
Top Kudoed Authors
Users online (60,492)