How can I check if a user is in a Telegram group? I get a reply that he is out

Question

I use the NodeJS Telegraf package to program my Telegram bot. I'm trying to check if the user is in the channel using the following code:

 const channelLeft = await ctx.telegram.getChatMember("@dji_fly_app_hebrew",ctx.message.from.id);
console.log(channelLeft.status)

And I always receive in the status that it is outside... ("left") Even if the user inside the channel... The bot has all access to the channel.