Turn on “Sync Meta Updates” from Memberium->Settings->Performance.
Go to Memberium->Sync Options->BuddyPress Fields and choose the Infusionsoft field which you’d like to sync with.
TEST TEST TEST!
Note: Always make sure your BuddyPress and Memberium are updated to the latest version if you find something not working as per your expectations. In case you need any assistance or help, please do let us know here and we’ll be happy to help :).