It's not on your Nano X - none of your assets really is! The Nano X just holds your privat keys!
What you most likely mean is, that you can't see your assets on Ledger Live, and you're right about that - as XDC is not (yet) supported by Ledger Live.
Your assets are not lost though. You just have to manage them from a 3rd party application - like for instance app.mycrypto.com/ , myetherwallet.com or an other likewise app.
Open the chosen app and log in with your Ledger Nano X - and your assets will be there for you to see and manage.
(If they are not there, you have sent the assets to a wrong address, and they are indeed lost.)
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It's not on your Nano X - none of your assets really is! The Nano X just holds your privat keys!
What you most likely mean is, that you can't see your assets on Ledger Live, and you're right about that - as XDC is not (yet) supported by Ledger Live.
Your assets are not lost though. You just have to manage them from a 3rd party application - like for instance app.mycrypto.com/ , myetherwallet.com or an other likewise app.
Open the chosen app and log in with your Ledger Nano X - and your assets will be there for you to see and manage.
(If they are not there, you have sent the assets to a wrong address, and they are indeed lost.)