wordpress text widgets: show on selected pages only

Hello,

I want to show a text widget on selected pages only but my code is not working.

in the widget context: under target by URL , I have entered /pagename but this doesnt work.

On my site I am using default permalink,
i.e my page url is https://sitename.com/?page_id=98

so please suggest how should i target this url so that the text widget only shows on this page. I have tried so many variations but it doesnt work at all.

Please help.

Regards