Get option chain ric code

Why for some underlying I haven't an output without error for the following code ?

ek.get_data("NOKIA.HE",['OPTION'])

Out :

( Instrument OPTIONS

0 NOKIA.HE NaN,

[{'code': 251658244,

'col': 1,

'message': "Error: Field 'OPTIONS' was not found in response for the instrument 'NOKIA.HE'",

'row': 0}])

For the fifty underlying of .STOXX50E I have 13 underlying with this error.

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