Windows issues following Core Agent 2.7.6 and Intercept X 2.0.17 update. See KBA 135504 for more information.
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if you have a company with Umlaute in the Organization name, its not possible to change this. If you make a OU instance of a Ö the Interface show the OE and after a few secounds you have the old value in this field.
So you have no way to change anything and lets encrypt will not work in this case.