Hi , @hans3400
According to your description, When you refresh the data , it returns the error code "The key didn't match any rows in the table".
When Power BI Desktop refreshes, an error is usually reported because an error occurs in a step in PQ, resulting in the inability to obtain the corresponding data.
You can click the "Transform data" in the "Home":
Then we can go to each query and it's each steps to check if has an error.
We need to solve all the error code in the Power Query Editor so that we can refresh our data in Power Bi Desktop.
Thank you for your time and sharing, and thank you for your support and understanding of PowerBI!
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly