Dataflow Fails "missing credentials"

[jnickell]

We had two established and working dataflows that all failed during their scheduled refresh last night/ this morning citing: 

Error: Data source credentials are missing or invalid. Please update the credentials for Cds in dataflows settings page and try again.

Both of these were refreshing from a Microsoft datasource (Dataverse for one, Sharepoint List for the other).  Opening the dataflow and re-signing in seems to have resolved the issue, but I'm unsure how the dataflow lost it's credentials. One of the dataflows' signed on user had their password updated yesterday, but I don't remember previous password changes causing this kind of failure.

[Pete_Q]

I've got a similar situation.  I have one dataflow that is a source for a second dataflow and I'm now getting an invalid credentials error on the second dataflow (both created under my account.)  Similarly, this failure coincides with a password reset.