Error #214 "You do not have permissions to open this file in the browser."

Quick Info

TagLinker indexer try to read your Excel file via the browser. 
TagLinker has no permissions to open the Excel file in the browser. 
Microsoft need to allow your browser to open Excel files.

Workaround Solution

Just Sign in to your Microsoft account with your browser and open any Excel file to save your credentials on your browser. 
Now you should be able to open the Excel file from the Indexer.

AI Comment

The Excel API in Microsoft Graph relies on the Excel Online backend service to process Excel files. For some reason (which Microsoft hasn't fully documented or consistently fixed for personal accounts), when an Excel file in a personal OneDrive account hasn't been "activated" or "initialized" by Excel Online recently, the Graph API requests to its specific endpoints (like usedRange, tables, etc.) can fail with the "You do not have permissions to open this file in the browser" error.

When you manually open the spreadsheet in your browser (Excel Online):

You are effectively "waking up" or "initializing" that specific Excel file within the Excel Online service.
Excel Online performs some background processing, caching, and prepares the file for interactive use.
Once the file is "active" in Excel Online, subsequent Graph API calls for that file then succeed because the underlying service is ready to handle the request.

Note

The demo version of TagLinker indexer read your Excel files via the browser. 
The paid version will read your Excel files via the server and this workaround solution won't be required.

Flow

graph TD
A[indexer - popInfo] --> B[microsoft - getBookInfo];
B --> C["You do not have permissions to open this file in the browser."];