Error getting License. License Server Communication Problem: E_ADEPT_DOCUMENT_TYPE_UNKNOWN

I purchased a book using google play, and when I try to fulfill it using ADE, I get the following error:

Error getting License. License Server Communication Problem:

E_ADEPT_DOCUMENT_TYPE_UNKNOWN

I tried with both epub and pdf, both had the same problem. Google support gave me the following instruction:

It looks like you’re having trouble reading your book with Adobe Digital Editions (ADE). Let’s try the following steps:

1. Check that the date and time is correct on your computer.
2. Make sure you’re connected to the internet.
3. Re-download the eBook.
   1. Remove the book from your ADE Library.
   2. Sign in to https://play.google.com/books.
   3. Next to the book, click More (3 vertical dots) > Download as ePub/PDF.
   4. Open the file in ADE.
4. Re-install Adobe Digital Editions.
   1. Uninstall ADE.
   2. Download and install the latest ADE.
   3. Restart your computer.
5. Get the latest Adobe Acrobat Reader (see system requirements).
6. Activate ADE and authorize your computer.
   1. Launch ADE.
   2. Activate your software:
      1. Choose Help > Sign In (if this is dimmed, you're already signed in and don’t need to activate your software).
      2. Sign in with your Adobe ID and password.
   3. Authorize your computer: choose Help > Authorize Computer.
7. Make sure that any firewall, antivirus, and proxy software on your computer isn’t blocking ADE servers. You can also check whether http://adeactivate.adobe.com/ is blocked. If it's not blocked, you should see "Welcome to Digital Editions."

If you still have trouble, please contact Adobe for additional support.

I followed all those steps, but http://adeactivate.adobe.com/ gives me 404 not found, and I have no idea why.

I pinged adobe:

ping adeactivate.adobe.com

Pinging adeactivate.wip4.adobe.com [192.147.130.145] with 32 bytes of data:

Request timed out.

Request timed out.

Request timed out.

Request timed out.

Ping statistics for 192.147.130.145:

    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

Is there something wrong with the servers? I was able to fulfill a book earlier in the day, so I doubt it has anything to do with a firewall on my computer; no configuration was changed during that time.