Hi, out of a sudden, on the 28th of November the auto refresh stops working with the above issue. Informationen from last try: Cluster URI: WABI-WEST-EUROPE-B-PRIMARY-redirect.analysis....
Does this problem occur when all datasets are refreshed or only some of them have problems with refreshing?
According to the error message you provided, I found some solutions, you can refer to the following.
Solved: Unable to connect to data source undefined - Microsoft Power BI Community
Solved: [Strange Error]: Unable to connect to the data sou... - Microsoft Power BI Community
Solved: Unable to connect to the data source undefined - Microsoft Power BI Community
Best Regards,
Community Support Team _ Ailsa Tao