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When editing an existing feature in the ArcGIS Online Map Viewer it is not possible to move a point or the vertices of the feature, even when full editing control is enabled.
This is expected behavior in ArcGIS Online. Feature services that have m-values enabled do not allow editing of the geometry of existing features. It is possible to add, delete, and edit the attributes of m-value enabled features, however the features cannot be moved spatially.
To edit the geometry of a feature service in ArcGIS Online, m-values must be disabled in the service properties. To remove m-values from an existing feature service, the source data should be altered and the service republished or overwritten.
Note: To edit geometry for existing features in the layer, the layer owner must move the data with m-values to a separate layer (which can be in the same service).