No, you can not.
You should first ask your teammates to create a confirmed profile. You can send them the following link - https://play.fiba3x3.com/signup - and they can select any language from the upper right hand corner top menu to sign up to a FIBA 3x3 profile.
When your teammates have a confirmed profile, you, as a team captain or a team lead, can just add search for their name and add to the team. No other confirmations are needed.
Note: If this feels different for the veteran FIBA 3x3 players than before, it is because the registration logic is different. play.fiba3x3.com and its predecessor 3x3 Planet used to have invite-via-email functionality, but that was discontinued due to many users mistaking just sending email invitation to be sufficient for the creation of the FIBA 3x3 profile