Failed to use the Add Features operation from ArcGIS REST API when any time zone is enabled rather than the (UTC) coordinated universal time zone.

Workaround

Use the Apply Edits operation instead to add features with any time zone enabled.

For example, use the following in the Adds:

[{"geometry":{"x":-14479267.442135924,"y":12867017.596026676,"spatialReference":{"wkid":102100,"latestWkid":3857}},"attributes":{"Date":1609315200000}}]

Steps to Reproduce