[maustingraphics82]

I think the issue is within this part of the code but posted everything in the message above.

// Create a new user
		$new_user_id = wp_insert_user( $userdata );

		// GFCommon::log_debug( __METHOD__ . '(): form => ' . print_r( $birthdate, true ) );

		if ( ! is_wp_error( $new_user_id ) ) {
			groups_join_group( $group_id, $new_user_id );

			// Make the user displayed as a staff on a clubhouse page
			if ( $role === 'staff' ) {
				$group_ids =  groups_get_user_groups( $new_user_id );
				$group = groups_get_group( array( 'group_id' => $group_ids['groups'][0]) );
				$group_id = $group->id;
				groups_promote_member( $new_user_id, $group_id, 'admin' );
			} else {
				groups_demote_member( $new_user_id, $group_id );
			}

			if ( ! empty( $notification ) ) {
				tml_send_new_user_notifications( $new_user_id, 'both' );
			}

			if ( ! empty( $birthdate ) ) {
				$date = DateTime::createFromFormat('Y-m-d', $birthdate);
				$date = $date->format('Ymd');

				update_field('user_birthdate', $date, 'user_' . $new_user_id);
			}
		}