For some reason reports that we are using have started to fail their refresh. I didnt make any changes to our reports, neither did our IT department. To my understandin, this problem started to occur randomly (a report that wasnt refreshed 2 hrs ago might get refreshed after, but then fails to refresh again randomly later on). And I'm having trouble to find a solution to fix the issue. We connect to data source with "Import" option from SQL DWH with an on-premises data gateway on a local computer. Also we have excel files that takes the data from a public network folder and tranfers it to respective reports. There is no problem while refreshing the report from desktop but It gives the error on refreshes coming from app.powerbi.com website.