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From number field to interval field


I would like to understand why the following works

sage: K1.<s1> = NumberField(x^3 - 2, 's1', embedding=RR(1.26))
sage: RIF(s1)

and the following does not

sage: K2.<s2> =NumberField(x^3 - 2, 's2', embedding=CC(-0.63,1.09))
sage: CIF(s2) 
Traceback (most recent call last)
TypeError: unable to coerce to a ComplexIntervalFieldElement

Thank you, Vincent