Should the light be on in the microwave oven when the door is opened?

No the light stays off when the microwave oven door is opened. The light comes on only when the microwave oven starts the heating operation. This is a normal operation and within the manufacture specification for the following US models; 


Model List
Date manufactured Model
Manufactured before March 2019 NN-SN651
NN-SN661
NN-SN671
NN-SA651
NN-SA631
NNSA651
NN-SB646
NN-SU686
NN-SU696
NN-SU656
NN-SU676
Manufactured before March 2019 NN-SB646
NN-SB428
NN-SB448
Manufactured before April 2019 NN-SB428
NN-SB448
NN-SD654
manufactured before year 2016 NN-SD681
NN-SN686
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