This is an useful snippet that will add your newly registered (via WPMU DEV Membership 2) member to corresponding BuddyPress group.

<?php
add_action( 'ms_model_relationship_create_ms_relationship_before', 'ms_controller_member_assign_memberships_done_cb', 99, 4 );
function ms_controller_member_assign_memberships_done_cb( $membership_id, $user_id, $gateway_id, $move_from_id ) {
// Create an array with membership IDs and group IDs like:
/*$array = array(
'membership_id' => 'group_id',
'membership_id' => 'group_id',
'membership_id' => 'group_id'
);*/
$config = array(
'11' => 4,
'19' => 3,
'20' => 2
);
groups_join_group( $config[$membership_id], $user_id );
}

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code.php
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You can add those codes in your functions.php in the theme, if you think your theme won’t be changed. Otherwise mu-plugins is the best solution. To use mu-plugins, go to /wp-content/ and find the folder with name ‘mu-plugins’. If there is no folder in that name, then create a folder, name it ‘mu-plugins’, create a file inside that, give any name you like and paste the code in there. You don’t need to activate that plugin. Mu-plugins means must use plugins, so it will be activated automatically always. If you use mu-plugins then add a php start tag at the beginning of the code.

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