I’ve tried over the course of a couple of weeks. I’ve tried in Firefox, Safari, and Chrome. I’ve ensured there are no browser extensions at all running. I’ve tried changing little details on the forms in case one of them was tripping it up. I’ve tried on two different networks, neither of which has anything like a firewall or extra blocking technology.
It’s broken.
It must not be broken for everyone, otherwise surely you’d have fixed it. But it’s broken for me.
First, it won’t take my legit new address. If I put the Suite number in there, which is extremely required for the mail to get into the right box, it’s invalid. But that error message? There is no “Street Name field”. You get this one box, that’s it.

I can get it to go through because I can get it to pre-fill with a suggested similar address then change the suite number to the correct one. Maybe that’s at the heart of the issue?
Once past that, eventually you need to collect your $1.10 and verify the address via credit card, which is completely fine and I want to do that.
It’s this screen. It is not possible to get past:

There are a bunch of console errors and warnings, a bit different in each browser. Above is Firefox. After clicking “Next”, a loader comes up for a sec then disappears. No feedback. It just doesn’t work. It’s broken.
I’ll have to stop into a physical office one of these days and see if they can file the change there. Not sure if they do that. I bet they tell you to do it online.
I did report it. It’s Service Request 79335936.
UPDATE: I got a call back about my service request the same day from a very nice lady in Portland. Here’s the deal. The USPS doesn’t care about the box number at the place I was forwarding my mail to. I did need to include that information, but I had to prefix it with “PMB” meaning “Private Mail Box” instead of “Ste” meaning “Suite” like I did before.
I had to format it exactly like this for their system to understand and accept it. This is un-knowable information, at least to me, but that’s what customer support is for I suppose and USPS was all over it. In fact they just left me a message the first time they called, then followed up a few hours later and I was able to answer the phone then and chat with them and it all worked out fine.
Same exact issue here. If the Suite number for the address doesn’t exist in their database then the site fails. I spoke with folks at our local PO and they mentioned the “red book” which often needs to be manually updated — even if you’re already receiving mail at that suite number. Manual processes to make automation work. They said it’ll take a few weeks. lol.