Using UserMulti field in the CAML schema
This was unexpected, and not documented at all in the SharePoint SDK.
When you create a UserMulti column, you must also specify Mult=”TRUE”, otherwise it will fall back to a standard (single select) User column type.
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<Field ID="{12312312-1234-1234-1234-123412341234}"
...
Group="My Group"
Type="UserMulti"
**Mult="TRUE"**
...
/>
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