2.1.96 Part 1 Section 7.4.9, text:user-field-get
a. The standard defines the element <text:user-field-get>
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This element is not supported in Word 2013, Word 2016, or Word 2019.
b. The standard defines the element <text:user-field-get>
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This element is not supported in PowerPoint 2013, PowerPoint 2016, or PowerPoint 2019.