With the caveat that you read the terms of service carefully.
You must select a recurring subscription (monthly or annual). The 2 for 1 service rarely applies to one-off purchases or trial conversions. Choose the "Premium" or "Ultra" tier, as basic tiers may be excluded. tyviania 2 for 1 service
If the 2-for-1 only applies to specific services, make sure to list them clearly in the fine print! With the caveat that you read the terms of service carefully