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TR closed. This issue does not depend on NoMachine. It is recommended therefore to update your installation to get the new Microsoft Edge based on Chromium.
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In the German keyboard layout, AltGr key + "<" writes the pipe symbol (|) but this key combination is ignored in Internet Explorer 11 and Microsoft Edge. As a possible workaround use the NoMachine's virtual keyboard inside the web session or use a different browser like Chrome or Firefox .
Ref. The NoMachine virtual keyboard: https://www.nomachine.com/DT09O00148#5.