RevokeSignInSessions not working for B2C tenant

Describe the bug

I am working on a feature to trigger revoking sessions for a user from all devices. The SignInSessionValidFromDateTime was reset, but the user could still get new access tokens using the refresh token.

Note: this is for a B2C tenant. I tried to use "Revoke sessions" from Azure portal and it works as expected. I am wondering if the portal is doing more than just resetting SignInSessionsValidFromDateTime value.

Expected behavior

The user logged in from other browsers should not refresh the access token once existing access token expires. Like what it does from azure portal, when "Revoke sessions" triggers for a user, all existing refresh tokens become invalid.

How to reproduce

1. Login as user in a browser
2. Run the program to revoke sessions and returns 200 response. var response = await _graphClient.Users[userId].RevokeSignInSessions.PostAsRevokeSignInSessionsPostResponseAsync();
3. Issue: the user keeps getting new access tokens once previous one expires.

SDK Version

No response

Latest version known to work for scenario above?

No response

Known Workarounds

No response

Debug output

</details>


### Configuration

_No response_

### Other information

_No response_

Start with the RevokeSignInSessions.PostAsRevokeSignInSessionsPostResponseAsync call in the reproduction against a B2C tenant, then compare its 200 response and refresh-token behavior with the Azure portal's Revoke sessions action. Done means identifying whether the SDK request or the B2C service causes refresh tokens to remain valid, with a reproducible result and an actionable fix or service finding.