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We couldn't get your SQL endpoint's updated schema
An internal error happened due to failed runtime assertion: Unsupported AS datatype:Unknown. Please try again later or contact support. If you contact support, please provide these details. Activit...
I have been in contact with Microsoft Support about this issue. The issue persisted several days. Since Monday morning (about 4 days since the start of the error) the error is gone and the expected tables show up in the Table view en the contents can be viewed. The support team assured me that they did not make any changes in that period, so the issue solved itself in some mysterious way.
Nice to know: allthough the tables did not show up in the Tables sections of Fabric, they did show up when I used used SQL Management Studio to connect to the environment.
As far as I am concerned this topic can be closed.