Hi i have reported this at UserVoice as well. Let me know if I should keep it to one place only.
Basically the "Go to website" feature of a Teams SharePoint tab does not work if the default browser is Edge or IE. This is due to the page contatining a script titled "sp-teams-tabcontent.js" which includes the usage of "URLSearchParams" which is not supported in IEhttps://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams.
Reproduce: - Ensure IE is set as default browser (so that link will open in this) - Add a SharePoint tab in a Teams Channel (using the SharePoint tab and not the Website tab) - Click the "Go to website" icon in the upper right corner