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Cannot Add Attachment To Email - Missing Attribute: a

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Cannot Add Attachment To Email - Missing Attribute: a

Cannot add attachment to Xfinity webmail, but another family member can using the same PC with the same Xfinity webmail client.  Error displayed... Error while attaching file(s) invalid request: missing required attribute: a

OS: Win 10 Pro

Browser: MS Edge

Latest MS updates installed

Latest version of Abobe reader installed

Latest version of Java installed.

Both users are local Admins