It seems you need to transfer your Telegram to your new iPhone.
This guide might help you:
1. Download and install Telegram on your new device.
2. Once installed, launch the app.
3. You'll receive a verification code on your old phone.
4. Accept the restore option and watch as all your chats, photos, videos, and files flood into your new device.

Happened to me before, just with the different messenger. I would say that you need to clean telegram cache first https://applenapps.com/clear-telegram-cache-on-iphone/. That should probably solve the problem . Otherwise try re-installing the app all over again. Good luck and please let us know how it goes.

When you choose to restore your data, your old messages, photographs, and videos will immediately begin to appear in your new device. baseball 9

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