Some contacts are not syncing with Telegram

Hey MHJB007,

Welcome to Apple Support Communities. The information below may help with syncing contacts.

You mentioned all "Contact Lists" are active and checked in the Phone app. Have you confirmed the all of your accounts on the device has contacts enabled? We ask because some contacts may be syncing from another email account. If contacts is disabled on that account, you will not see them in the list.

To check follow the steps below for each account and make sure Contacts is enabled. If it's not, that may be the reason the iPhone is missing some.

Turn Contacts on or off for an account

Want to add or remove all of the contacts from an account that you already set up? Just turn Contacts on or off for that account:

1. Go to Settings > Contacts > Accounts.

2. Tap the account that has contacts that you want to add or remove.

3. To add contacts, turn on Contacts. To remove contacts, turn off Contacts, then tap Delete from My iPhone.

Here's the article that include the steps above: Manage and delete contacts on your iPhone or iPad.

Take care.