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Property "" type mismatch, Expected: "object", Actual: "string".

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Posted on by mpapas

I am attempting to create a custom connector using the make.powerapps.com portal.

I have tried exporting the OpenAPI(v2) schema from Azure API Management and importing that into the custom connector wizard. I have gone through and checked all of the validation messages on each screen.

However, when I get to the Test tab, I cannot seem to get any response to come through from my API calls. The schema validation for the response fails with 'Property "" type mismatch, Expected: "object", Actual: "string".'

I have also tried creating a custom connector manually, importing a postman collection and am having zero luck getting it to work. Sometimes I get the response schema validation error I mentioned when I test, other times I get back no response at all.

Has anyone tried creating a custom connector lately using the Power Apps portal and actually gotten it to work? If so, I would *love* to see a sample of something that does work or if someone knows how to fix the aforementioned error, I'm all ears. Otherwise to me, this functionality seems broken.

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Connector development

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bbailey Microsoft Employee on at

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When you setup your connector are you passing in a subscription key, API key or some other form of authentication (what authentication are you using)? I was receiving that error until I passed in the appropriate key to authenticate who I was. At that point it started working fine. The message was frustrating and a bit vague, but once I found what I was missing that helped.

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mpapas 20 on at

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No, that wasn't it. I had the API key. I even tried just setting it to anonymous on the APIM side.

But I figured out my problem. Once I added "https://flow.microsoft.com" to the CORS policy of my APIM instance, everything started working.

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Bruce_Wang 4 on at

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mpapas - would you please share some more details about "I added "https://flow.microsoft.com" to the CORS policy of my APIM instance, everything started working." -- thanks a lot

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mpapas 20 on at

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Simply go to your API Management instance > All APIs:
Next, open the policy code editor:
Then add the URL under allowed origins:

HTH!

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lion 100 on at

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Hi
where is the API management entry? my webAPI is host in a public computer, it can invoke success from cloud flow>http action, but failed from custom connector, the error is 401( Property "" type mismatch, Expected: "object", Actual: "string".)

Property "" type mismatch, Expected: "object", Actual: "string".'

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