As a developer you create solutions for problems. If you do not understand the problem you cannot create a proper solution.
So domain knowledge is important for a developer. You do not need to be a domain expert, but you must understand what all the things are and how they relate to each other.
For the things you do not know, or cannot relate you obviously ask the domain experts for clarification. (Maybe they even overlooked something.)
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As a developer you create solutions for problems. If you do not understand the problem you cannot create a proper solution.
So domain knowledge is important for a developer. You do not need to be a domain expert, but you must understand what all the things are and how they relate to each other.
For the things you do not know, or cannot relate you obviously ask the domain experts for clarification. (Maybe they even overlooked something.)