Thank you Matt. That was going to be my next guess 🙂

Regards
Brajesh

Hi Matt,
Thank you.

Your steps are correct.

1. is bp-custom.php in wp-content/plugins directory?
2. Are you creating groups from front end or using some code?
3. Have you tried it with default WordPress theme and BuddyPress template pack? just to be sure that the theme is not interfering in case you are using a custom theme.

Regards
Brajesh

Hi Mark,

1. That code is already part of the plugin.
2. Here is an example.

add_action( 'bp_username_changed', function ( $new_username, $data, $user ) {

	$user_id = $user->ID;

}, 10, 3 );

Regards
Brajesh

Hi Matt,
Welcome to BuddyDev forums.

1. If you have the multi network plugin enabled, all the groups on each of the sub site are separate.

This plugin adds sub site specific prefix to the BuddyPress tables. That means, each sub site have their own groups table and the groups are independent of other sub sites( and each sub site group start with id 1). The ids do not conflict.
If ids are conflicting, there is some issue with the configuration.

Regards
Brajesh