I don't have the ConversionCoordinate widget available in the list fir my WAB or WAB for dev 2.17.
I'm using ArcGIS Enterprise 10.7.1
Go to Solution.
ArcGIS Enterprise 10.7.1 use WAB 2.12
About release versions—Portal for ArcGIS | Documentation for ArcGIS Enterprise
You need to upgrade to 10.8 at least to get that widget in Portal.
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