error decoding response body: missing field `access_token`

[TheZeldakatze]

Hello,
I'm trying to get an access token in order to start Minecraft
with a bash script, however when running the program,
it errors out with

Now awaiting code.
Now getting the access token.
Now authenticating with Xbox Live.
Now getting an Xbox Live Security Token (XSTS).
Now authenticating with Minecraft.
Error: error decoding response body: missing field `access_token` at line 4 column 1

Caused by:
    missing field `access_token` at line 4 column 1

Is there something I've missed?

kind regards,
zeldakatze