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Cannot add Flows to Powerapp - 'Registering Error'

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Posted on by martinav

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I am getting a "Registering Error" when attempting to add this flow to PA. This is a new one. Any ideas what this means?

It seems to apply to this one, and any new ones I try to create. I already have a few flows in this app that are working. Why wont it add?

I have tried other flows that were created long ago and they add fine too. whats up?

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martinav 3,340 on at

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Well...

It seems that you cannot send an array variable from PowerApps to flow. Setting an array variable is not happy. It is not allowing a Powerapps input for value. I have tried it more than once. If I try to do this, it results in the "Registering Error".

So, the question now remains... how do you send an array of values to Flow??

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martinav 3,340 on at

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With what was learned here, the issue is simply passing an array to Flow. Its not working. This post seems to answer the issue with a work-around.

https://powerusers.microsoft.com/t5/General-Discussion/Registering-error-when-trying-to-add-a-Flow-to-Powerapp/m-p/159680

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Ok it's an old post but this may help. I pass two strings, the User().Email as the first and a label as the second parameter (for some reason it requires them in reverse order):
MyFlowName.Run(User().Email, Label17.Text);
Back();
In the flow I ask Powerapps and wrap the string in square brackets in the initialize Array variable step
I needed the email address to be an array in order to append it to another array of email addresses further down in the flow.

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@martinav yes I think it's possible. In my case, it all started with this error
Unable to process template language expressions in action 'Compose_-_union__distinct(PMs_and_current_user)' inputs at line '0' and column '0': 'Template language function 'union' expects parameters of same type, but found 'Array,String' distinct types.'.
So I needed the current user to be an element in an array. Simple, I thought: switch variable to type Array and put square brackets around the parameter passed. And yes, this worked! I have two flows that use this approach.
After I edited one of them, it stopped working. No error message in the app, no failed run notification, it simply would not trigger at all. Reason: The Method 'Run' has an invalid value for parameter... I tried to switch the type back to String but to no avail. So I decided to remove the trigger, added it again, re-defined the init var steps, but still no joy. Next step was to remove the flow altogether from the app and then add it again. Now I got the
error which took me to the this post, which put me on the right track.
- initialize the variable as a String variable
- add the flow to the app (no registering error)
- switch the variable to type Array, wrap the value in square brackets.
I'm glad I got it to work again, and hope this post may help somebody with the same issue.

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