add an additional esim to my new iPhone16 Pro Max

I have iPhone 12 Pro Max with Dual SIM (1 Tmobile & 1 International eSIM). I have recently traded my iPhone12 with Xfinity and got iPhone 16 device. I have ported my Tmobile number to Xfinity mobile successfully. However, I am unable to add a second eSIM to my new iPhone 16 by transferring from old iPhone 12. Tmobile carrier supports dual SIM on Apple iPhone without any issues. Is Xfinitiy Mobile carrier doesn't support dual SIM on Apple iPhones ? Is this a kind of limitation if we choose xfinity mobile carrier with iphones? If yes, when would be xfinity mobile able to support dual eSIM on iphones?

I am kind of blocked by switching to xfinity mobile now.