Hi for_msqna,
Thank you for your question. I checked the article for Workbook table row and it seems that all of the sample is using /me/drive. I also verified the Workbook and charts overview under https://learn.microsoft.com/en-us/graph/api/resources/excel?view=graph-rest-1.0 and it seems that all of the sample also is using /me/drive.
It maybe that adding a row to Excel present in another drive is not yet available as of this time. To verify further, here is what you can do:
- Provide feedback on the https://learn.microsoft.com/en-us/graph/api/table-post-rows?view=graph-rest-1.0&tabs=http documentation by going to the lowest part of the page and click on This page under Submit and view feedback for and request information if this only supports /me/drive.
- If they advised that it is not supported, please provide another feedback on https://feedbackportal.microsoft.com/feedback/forum/ebe2edae-97d1-ec11-a7b5-0022481f3c80 so that our developers can see what needs to be improve on our services.
I hope I was able to provide insight on your question. Have a great day ahead.