Trying to run Login graphql query(Magento 2) in jmeter with graphql http request but request is not being sent properly and results in 500

Below is the query I am trying to run to generate customer token. Can somebody help me out?
Query runs successfully in Postman.

mutation Login($email: String!, $password: String!) {
generateCustomerToken(email: $email, password: $password) {
token
customer {
…CustomerFragment
}
}
}

fragment CustomerFragment on Customer {
email
firstname
lastname
mobilenumber
user_source
pushnotification
group_id
is_subscribed
pushnotification
}

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[enter image description here](https://i.stack.imgur.com/RfLnO.png)