Hello Vladimir Privalov,
Thanks for reaching out!
As per my testing, List Rows Graph API is working as expected. I'm using below Graph endpoint to get the rows in a table.
GET /me/drive/items/{id}/workbook/worksheets/{id|name}/tables/{id|name}/rows
However, on using GET /me/drive/items/{id}/workbook/worksheets/{id|name}/tables,
when I don't have any tables in my worksheet returns NULL response.
Please make sure you are querying on right worksheet to get the table data and rows.
Hope this helps.
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