Dear all
I have seen in so many question people are asking how they can assign a ticket for some one based on a custom field value, here I have something for you guys which is 100% working.
Please dont forget to vote.
Go to the project setting
Automations
Create new rule
Issue created
Assign issue << Specify user << Name of the user
in conditions
issue fields condition
field: service team then Set the condition :equal and Value : to one of your values
remember you have to create new rule for each user.