For all requests in App Insights the property client_Browser is empty for some reason.
How can I make App insights populate client_Browser column?
This feature(client_os, client_browser are populated in app insights) has been deprecated for a long time, see the issue here.
As of now, client_Browser is only populated in the pageViews telemetry, but not in request telemetry.
Here is the screenshot of pageViews telemetry:

If you just want to query the requests based on which browser, you can simply join pageViews table and requests table via session_Id in the Application Insights logs.
Also, here is the request feature about this, please upvote it.
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