I am talking from personal experience--
To activate a new Air India miles membership (for friends and family bookings using miles), you 1st need to book 2 different PNR full cash REVENUE flights in your name on the Air India app (no one else can fly)
You have to be on those 2 flights , you cannot miss them.
I recommend booking a flight to the cheapest place near your hometown and the second flight to return to your hometown.
You have to book two one way tickets (two different PNR), not one return ticket.
After completing those 2 revenue flights you will get some points automatically credited in a few days, (which will show in your Air India app) and then your membership is automatically activated for friends and family bookings.
There is no need to create a pool.
Kindly Mark this as your solution please and give me maximum points for my reputation. Thanks 🙏