You are not alone on this problem- this has happened to two other organizations that just I know of so far...
same bat time, same bat place, and there have been no new extensions deployed, so Microsoft is almost certainly to blame for this.
The issue seems to be that the Dynamics 365 Business central Connector in PBI doesn't even work anymore.
We tried opening a new blank PBI report, and used the "get data" -> other -> D365 BC connector function, and the connector itself throws an error even when querying the instance of BC attached to the user account.
The connector is what it is- there no way to modify how it works as far as we can tell.
Has anybody found a workaround to this yet? We have stakeholders screaming at us!