T-Mobile Device Unlock (Pixel)

This shouldn't be such a headache to deal with, show some competency, T-Mobile. The app doesn't appear to be working on Android 10 on my Pixel 3a XL. It simply tells me that there are server errors (which is terrible practice from a development standpoint because it clearly isn't the server). I also can't downgrade to 9 because my phone is carrier locked. I contacted support and after a month of going back and forth with them, they told me to use the app to unlock but it doesn't even work.

Junk app, it does not work at all. It always gives an error code 995 (no network connection) though I connected via LTE network and I was able to browse all possible websites. Waste of time for customer and customer service. This app is going to drive the customer away from T-Mobile (btw, I have been th customer with T-Mobile for 10+ years).

Can we have a class action lawsuit against T-Mobile? Our phones are paid off. We have fulfilled the 24 or 36 months promotions. Yet, they refuse to unlock our phones to bring to another provider. I paid for this phone in full, I should have the right to bring it and use it whenever I choose. Customer service says download this app, yet the app does not work.