Will not authenticate to Icecast 2 server

Mixx will not perform a Basic login authentication. When receiving an authentication challange from the Icecast server, it quits and produces the following error:
Please retry current operation.
Please check your connection to the Internet and verify that your username and password are correct.

WIRESHARK ENTIRE TCP STREAM AS FOLLOWS:
SOURCE /wolfradio HTTP/1.0
Host: fm.wolflake:8080
User-Agent: libshout/2.4.3
Content-Type: application/ogg
Content-Length: 0
Connection: Keep-Alive
ice-public: 0
ice-name: Wolf Lake
ice-description: This stream is online for testing purposes!
ice-genre: Live Mix
ice-url: http://fm.wolflake
ice-irc:
ice-aim:
ice-icq:
ice-audio-info: bitrate=128

HTTP/1.0 401 Authentication Required
Server: Icecast 2.4.3
Date: Fri, 18 Dec 2020 05:24:10 GMT
Content-Type: text/plain; charset=utf-8
WWW-Authenticate: Basic realm="Icecast2 Server"
Cache-Control: no-cache
Expires: Mon, 26 Jul 1997 05:00:00 GMT
Pragma: no-cache
Access-Control-Allow-Origin: *

You need to authenticate

END OF WIRESHARK STREAM There are no more transactions.

MIXXX running on:
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal

ICECAST2 running on:
Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Codename: bionic
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-04-29 (235 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
Package: mixxx 2.2.3~dfsg-1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.4.0-58.64-generic 5.4.73
Tags: focal
Uname: Linux 5.4.0-58-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: True