Hi =D,
Teams for the web does not currently provide the built-in "Make a test call" feature that is available in the Teams desktop client. Microsoft's test-call feature is found under Settings > Devices > Make a test call in the desktop app, but it is not available in Teams on the web.
Since you're using Teams on the Web, you can test it here https://devicetest.teams.microsoft.com/ and change the settings.
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