Your Inner Circle invite is a personal, one-person link. It is created only after your subscription is verified.
Steps
In your chat with @PickBotSubscriptionbot, tap the invite link.
Telegram shows the PickBot Inner Circle. Tap Join.
Open the channel and turn on notifications. See Turn on Telegram notifications so you don't miss a pick.
Rules for your invite
It works for one person. Once you join, it cannot be used again.
Do not share it. If someone else uses it first, you can't join with it.
Join with the Telegram account you plan to keep.
Expected result
The Inner Circle appears in your Telegram chat list and you see new picks as they are posted.