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Devid RajDevid Raj 

Service Setup Not Available in Lightning Experience

I'm Logged in as a System Admin but I am not able to access Service Setup.
User-added image
Raj VakatiRaj Vakati
Generally, there is the reason  The user must have service cloud user permission and i am sure your user is having that permission .. 

To set up a Lightning Service Console:

Customize Application
+Service Cloud User  permission at the user level  is require d

I guess its an instance-specific issue.  I will say Create a new developer account and see ...

fallow the link to get your answer :