Phone trade-in return labels

I purchased 2 iphone 15's last week, and then accepted the trade-in offer for my 2 old iphone 14s. The following day, I received 2 emails asking me to return my devices soon. When I click on the purple tab "print your return label", it brings up a blank screen. I've tried the link at work, at home, and my in-laws house, and it is just a blank screen. I started a customer service chat last Thursday, and I was assured that I would receive new emails within 24 hours but I received nothing. I then called customer service last night, and I stayed on the phone for over 30 minutes but my call was lost when one agent transferred me over to a different department. I only have about 2 weeks left to return the old phones to xfinity.