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can't open attachments ie11, but can when using Edge. Xfinity webmail. What it the fix?

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can't open attachments ie11, but can when using Edge. Xfinity webmail. What it the fix?

Getting an error when trying to open attachment incoming and outgoing. Xfinity webmail, IE11, and Windows 10. Error "HTTP ERROR 404-Problem accessing/service/home/-/.Reason: must authenticate. Checked settings in IE11 options and nothing has changed.