Re: O365 Excel opening error for PowerBI source file

Hi ,

Firstly, regarding to the issue that you fails to open Excel file in O365, please post the question in the Office forum to get dedicated support.  Meanwhile, you can review the following similar threads to troubleshoot the first error.

Excel file unable to open online (One drive/sharepoint)
OnDrive error "Request was taking too long"

Secondly, the second error could occur when you put an invalid URL path to be the source in Power BI, please check if you can open the URL successfully in browser and follow the instructions in this blog to handle error 404 in Power BI.

Thanks,
Lydia Zhang