Way of telling which datasource is missing credentials, when they all appear to be valid?

[Anonymous]

Hi, I keep getting this message after I upload my report and try to setup a schedule for refresh.

But I checked each datasource and each are active with data available for the report. 
Is there a way to tell? I went into datasource settings confirmed my credentials are active but I still get this message...

[Anonymous · Accepted solution]

Thanks.  Having exhausted all possibilities, I received an answer internally that we are not able to set up scheduled refresh in development servers.  
When I asked why, I kind of got a "that's the way they do things here" response, but possibly the generation of data is a cost?

Anyway, thanks for your help.

[lbendlin]

Sometimes you get the little triangle. Other times it is a guessing game.  Yet other times it is actually an expired OAUTH token in a gateway connection that you use in your dataset.  Totally opaque.