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Accessing an App through 'Open in new window' from Teams only opens file error
This happens because Teams is still trying to open the last file you accessed through the “Open in new window” option, which in your case has been deleted. Instead of opening the Excel home page, Teams is following that old file link and showing the error. To fix it, sign out of Teams, clear the app cache, and restart it, this usually removes the stored reference to the deleted file. If that doesn’t help, try opening Excel directly from the Teams app launcher or through another document, which forces it to create a fresh window. As a last step, updating or reinstalling Teams can also reset the integration with Office apps and get the “Open in new window” option working normally again.
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Don't forget to mark as solution if my answer suits you
This happens because Teams is still trying to open the last file you accessed through the “Open in new window” option, which in your case has been deleted. Instead of opening the Excel home page, Teams is following that old file link and showing the error. To fix it, sign out of Teams, clear the app cache, and restart it, this usually removes the stored reference to the deleted file. If that doesn’t help, try opening Excel directly from the Teams app launcher or through another document, which forces it to create a fresh window. As a last step, updating or reinstalling Teams can also reset the integration with Office apps and get the “Open in new window” option working normally again.
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Don't forget to mark as solution if my answer suits you