Unable to downgrade iCloud+ storage due to greyed out options
From the attached screenshot, you can see that I am using less than 200 GB. I want to downgrade from 2 TB, but the "Done" button is greyed out to complete the downgrade. I tried on my iPhone, as well, but it's basically the same—only on the iPhone, there is no Done button at all.
[Re-Titled by Moderator]