Dataflow problems - Table.Combine Functions Since August 15 2023

Dear Power BI Community,

Since August 15, 2023, I'm experiencing issues refreshing a Power BI Dataflow in Power BI Services.

In this Dataflow I combine 10 Dataflows named CREmployee and add 5 Dataflows to enrich the data (see screenshot).

I've been trying to solve the problem for days.

This is the error message I get "The credentials provided for the PowerBI source are invalid. (Source on PowerBI.)".

This is the error message after the Scheduled refresh did not succeed: "Data source credentials are missing or invalid.  Please update the credentials for PowerBI in dataflows settings page and try again. [Path: PowerBI]".

When I try to update my username and password, nothing seems to be wrong:

When I try to make a smaller Query Table.Combine({#"CREmployee 1", #"CREmployee 2"}) the error still exists.

When I make another Dataflow and combine tables I don't have problems with my credentials.

Table.Combine({CRVacancy1, CRVacancy2, CRVacancy3, CRVacancy4})

 

When I look at the Datasources in my Dataflow I see 2 Datasources

1. PowerBi

2. PowerPlatformDataflows

Could this be the rootcause of my problem?

Was there an update in the Power BI Services on the 15th of August 2023 that might be the root cause of my problem?

I hope someone of you is able to help me.

Thanks a lot

Kind regards

Louis van Paassen