https://ecocitycraft.com/forum/wiki/main-boostitem/

For the /boostsend command line, it states:

/boostsend <username> - Send item boosts to another user.


The command doesn't quite work that way and we have to specify the amount being sent and took me a about five minutes to get it to work. It should be as following (with the new addition in red):

/boostsend <username> <amount> - Send item boosts to another user.