FUE (Follow Ups) integration needs to be updated - PHP error

[Valentina R]

Change needs to be done on line 417 in \woocommerce-appointments\includes\integrations\woocommerce-follow-up-emails\class-wc-appointments-integration-follow-ups.php.

From:

$appointment_order->shipping_phone ?? '';

To this:

$appointment_order->get_shipping_phone() ?? '';

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Reported here.

[Željan Topić]

Added with 4.17.0