How to achieve unique access token from Azure AD for millions of clients with OAuth2

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I am using Azure AD for OAuth2 implementation for my project. This is a telecom Project where millions of clients/subscribers are connected to our server.
The idea is to implement OAuth2 with Azure AD as Auth Server and create a single Project/APP registration for all the clients/subscribers belonging to a single operator/company (e.g. Vodafone) in Azure AD and generate "Access tokens" so that the clients can use theses token to fetch the resource server.
However the access tokens generated by Azure AD is the "same for all the clients" which is not acceptable to our requirements. This will be a serious violation of data because we wanted to keep data as "claim" and get them as part of access token.
The expectation is to ensure Azure AD generates unique access token for each client. Please inform how to achieve this.
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