Get viewer username inside extension

How I can get username after viewer share their id?
I know about https://dev.twitch.tv/docs/api/reference#get-users endpoint, but it falls with “OAuth token is missing” message and I don’t see how I can get any valid token without extra OAuth authorization. And I also don’t want to use deprecated v5 api.

This example describes a suitable work flow:

You have to send it via an EBS

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