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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.
https://success.salesforce.com/issues_view?id=a1p3A0000001D14QAE
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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
AND
+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 ...



https://help.salesforce.com/articleView?id=console_lex_service_setup.htm&type=5

 
DixitSDixitS
fallow the link to get your answer : https://help.salesforce.com/s/articleView?id=sf.console_lex_service_setup.htm&type=5