GraphQL login problem

When I generate a customer token via Magento GraphQL, I am able to perform authenticated operations such as createCartAfterSignIn without any issues. However, I do not see the customer session reflected in Customers → Now Online in the Magento Admin.

I am currently developing a new Next.js frontend that communicates with Magento exclusively through GraphQL. Could this be the reason the customer session is not appearing in the admin, and why does Magento not show the user as online in this case?