BuddyPress.org

In BuddyPress there is a built-in mechanism for synchronizing profile fields from WordPress.
By default, it synchronizes only the “display_name” field, which is not always sufficient.
Here is an example of the code by which you can synchronize any available fields in the WordPress field with the Buddypress fields

function xprofile_sync_bp_profile2( &$errors, $update, &$user ) {
	// Bail if profile syncing is disabled.
	if ( bp_disable_profile_sync() || ! $update || $errors->get_error_codes() ) {
		return;
	}
    // Querying data from a table "usermeta", first we get the value of the custom field "address" and substitute this value for the "Address" field of the xprofile BuddyPress
    $address = get_user_meta( $user->ID, 'address', 'true' );  
	xprofile_set_field_data( 'Address', $user->ID, $address );
  	//Similarly with other fields
    $firstname = get_user_meta( $user->ID, 'first_name', 'true' );  
	xprofile_set_field_data( 'Name', $user->ID, $firstname );
  	$lastname = get_user_meta( $user->ID, 'last_name', 'true' );  
	xprofile_set_field_data( 'Lastname', $user->ID, $lastname );
  	$description = get_user_meta( $user->ID, 'description', 'true' );  
	xprofile_set_field_data( 'Bio', $user->ID, $description );
  
  	// Querying data from a table "user"
    xprofile_set_field_data( 'E-mail', $user->ID, $user->user_email );
    xprofile_set_field_data( 'Site', $user->ID, $user->user_url );
}
add_action( 'user_profile_update_errors', 'xprofile_sync_bp_profile2', 10, 3 );

Unfortunately, the fields are synchronized only when the profile is updated. I do not know how to start mass synchronization 🙁

I hope someone will find this information useful.