The deauthorize button on Apple Music for Windows 11 is broken

Windows 11 PC, Apple Music/Apple TV tried.

The "Deauthorise All" button is broken.

All I get is a text window titled "This XML file does not appear to have any style information associated with it. The document tree is shown below." and below is raw XML! I assume this is an Apple Devs Only bugfix, but I'm trying here in case someone has a genius solution that I haven't tried.

I've tried uninstalling and reinstalling them. I've tried a restart. I've been in support for 40 years, so I think I've tried pretty much everything (unless you can suggest something new - I'm all ears) and all I get is:

"This XML file does not appear to have any style information associated with it. The document tree is shown below."

and below is raw XML:

This XML file does not appear to have any style information associated with it. The document tree is shown below.

<plist version="1.0">

<dict>

<key>pings</key>

<array>

<string>https://xp.apple.com/report/2/xp_its_main?code=MZFinance.DeauthConfirmDialog&buttons=Deauthorise%20All%3ACancel&baseVersion=1&dsId=272666939&eventVersion=1&storeFrontHeader=143444-2%2C42%20t%3Atv1&eventTime=1710679621768&eventType=dialog&message=Deauthorise%20computers</string>

</array>

<key>metrics</key>

<dict>

<key>dialogId</key>

<string>MZFinance.DeauthConfirmDialog</string>

<key>message</key>

<string>Deauthorise computers</string>

<key>options</key>

<array>

<string>Deauthorize all computers</string>

<string>Cancel</string>

</array>

<key>actionUrl</key>

<string>p15-buy.itunes.apple.com/WebObjects/MZFinance.woa/wa/deauthAllMachinesDialog</string>

<key>asnState</key>

<integer>0</integer>

<key>mtTopic</key>

<string>xp_its_main</string>

<key>eventType</key>

<string>dialog</string>

</dict>

<key>failureType</key>

<string/>

<key>customerMessage</key>

<string>Deauthorise computers</string>

<key>m-allowed</key>

<false/>

<key>dialog</key>

<dict>

<key>m-allowed</key>

<false/>

<key>message</key>

<string>Deauthorise computers</string>

<key>explanation</key>

<string>Are you sure you want to deauthorise all your currently authorised computers?</string>

<key>defaultButton</key>

<string>ok</string>

<key>okButtonString</key>

<string>Deauthorise All</string>

<key>okButtonAction</key>

<dict>

<key>kind</key>

<string>Goto</string>

<key>url</key>

<string>https://p15-buy.itunes.apple.com/WebObjects/MZFinance.woa/wa/deauthAllMachines?xToken=AwIAAAECAAH70AAAAABl9uXzXlMm9r%2BrG5Lv8A3u8Z1IjAKlN7k%3D&workflowID=7029&hasConfirmedDeauthAll=true</string>

</dict>

<key>cancelButtonString</key>

<string>Cancel</string>

<key>initialCheckboxValue</key>

<true/>

</dict>

<key>cancel-purchase-batch</key>

<true/>

</dict>

</plist>

[Re-Titled by Moderator]