Please enable Plugin generated posts option in Post to Telegram settings. That should fix it.
If it still doesn’t work, then please enable both the logs in Advanced Settings and try again. Then send View log links to our support on Telegram (@WPTelegramSupport).
DO NOT SHARE THE LOGS HERE.
Thank you for sharing the logs. It looks like you use Bulk Import to create posts and the plugin doesn’t by default send posts when importing or when doing bulk edit. Please add these two lines to functions.php of your child theme to fix that.
add_filter( 'wptelegram_p2tg_send_if_importing', '__return_true' );
add_filter( 'wptelegram_p2tg_send_if_bulk_edit', '__return_true' );
