Can't change username in minecraft.net, website freezes

The website freezes after clicking "Change Profile Name" button. I already re-searched for an issue for this, but they didn't give me answers how to fix this.

Steps how to do this:

**1. Go to https://my.minecraft.net/en-us/profile/

2. Go to "Profile Information" and click "Change" on "Profile Name"

3. Write a new profile name you want and a current password

4. Click "Change Profile Name".

Website freezes and console doesn't give any results. I have tried multiple solutions already, like changing browsers, removing cache, using incognito window and trying different username. I changed my e-mail and password on the account a week ago, I hope that's not the thing here.