How to correctly import an author name with diaeresis (two dots over a letter) from EndNote X9 to a Word document as in-text citation?

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I would first try to reproduce the same issue in a new document with some of the same references.

If the issue cannot be reproduced then I would try the following steps on our website to clear the current document of corruption.

https://support.clarivate.com/Endnote/s/article/EndNote-Problematic-field-codes-causing-jumping-cursor-the-range-cannot-be-deleted-or-other-problems-while-formatting?language=en_US

If the issue persists or the issue happens with any document then please contact Technical Support for help with this issue.

1-800-336-4474 option 4 then 1

or
https://endnote.com/contact/