unable to expand GraphQL types within subgraph

Currently, I am leveraging Apollo Federation alongside TypeScript to develop subgraphs and a GraphQL federated server. In one subgraph, I've defined a type and now I aim to extend it by adding a new field in another subgraph. To achieve this, I implemented the following syntax in my typedefs.

extend type MyType @key(fields: "id"){
    id: ID! @external
    myAddedField: [String]
}

Unfortunately, upon running this code, I encountered an error.

GraphQLError: Syntax Error: Unexpected Name "extend"

Can someone help me pinpoint what I might be doing wrong? Grateful for any assistance offered.

typescriptapollo-federation

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