[yusufhm]

Good catch Prashant, although mine was not working even though I was calling that function.

[yusufhm]

Looks like we both followed the same article: https://codex.buddypress.org/plugindev/how-to-edit-group-meta-tutorial/

I was able to resolve the issue you were having by modifying the custom_field function a bit, so it becomes like this:

function custom_field($meta_key='') {
        $value = groups_get_groupmeta( bp_get_group_id(), $meta_key);
        if ($value) {
            return $value;
        }

        $bp   = buddypress();
        if ($bp->groups->current_group) {
            $group_id = $bp->groups->current_group->id;
            return groups_get_groupmeta($group_id, $meta_key, TRUE);
        }
        return FALSE;
}

It looks like the meta value’s already saved after the first step, and your group already has an ID; so it’s just a question of retrieving that. bp_get_group_id() somehow does not do the job for I don’t know what reason (maybe the group is not yet visible, or the cache has not been updated yet).