SharePoint CamlQuery Error HRESULT 0x80131904

Author: Sebastian Riesner, Published: 8/21/2019 1:24 PM

When I do this caml query to a list in our SharePoint Online tenant in Office 365:

<View><Query><Where><GEq><FieldRef Name='Modified'/><Value Type='DateTime' IncludeTimeValue='TRUE'>2019-08-21T09:02:21Z</Value></GEq></Where></Query></View>

...I'll get an "HRESULT 0x80131904" error back.

As it turned out, it's just a little typo, which causes this error. When I replace "GEq" with "Geq", it works!