Power Query cannot load Web API during evaluation but refreshes

[Imrans123]

Hey guys, 

I started having quite a strange issue. I have an API call that returns a authentication key and then uses that request key to query data. I coded it in power query and has been working really well for the past 1 month.

Ever since today, when i open the dataflow in power Query, the table won't load as it says Credentials are required to connect to websource 

I tried going into dataflow settings to see which API call is giving the issue, and found the APi call that is trying to call the request key giving the issue. Below is the error message 

What's strange about this issue is when I refresh the dataflow, I can see from my API portal that it sucessfuly called the authentication API followed by querying all the data.  

I tried changing privacy settings, but that didn't solve it. In all cases I'm getting Error 400. 

[lbendlin]

Are you saying that you are getting the key back despite the 400 ?  You can use ManualStatusHandling to override the default responses.