No soundcloud songs able to download to server.

[NobodyCareWho]

Bandcamp and other online files work, but soundcloud always returns Failed to download radio station errors. None of the songs I tried required their premium subscription.

[AlbusRex]

I am experiencing the same issue in 1.21.1 with etched 5.0.0 on neoforge 21.1.228, possibly a duplicate of #201

[xx:xx:xx] [Download-13/ERROR] [gg.mo.et.ap.so.AbstractOnlineSoundInstance/]: Failed to load audio from url: https://soundcloud.com/nate-vlogs-792349357/minecraft-nether-warmth
java.util.concurrent.CompletionException: Failed to connect to SoundCloud API
	at TRANSFORMER/etched@5.0.0/gg.moonflower.etched.api.sound.download.SoundSourceManager.lambda$getAudioSource$3(SoundSourceManager.java:83) ~[etched-5.0.0.jar%23455!/:?] {re:classloading}
	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?] {}
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?] {}
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?] {}
	at java.base/java.lang.Thread.run(Thread.java:1583) [?:?] {re:mixin}
Caused by: java.io.IOException: 404 Not Found
	at TRANSFORMER/etched@5.0.0/gg.moonflower.etched.common.sound.download.SoundCloudSource.get(SoundCloudSource.java:65) ~[etched-5.0.0.jar%23455!/:?] {re:classloading}
	at TRANSFORMER/etched@5.0.0/gg.moonflower.etched.common.sound.download.SoundCloudSource.resolve(SoundCloudSource.java:77) ~[etched-5.0.0.jar%23455!/:?] {re:classloading}
	at TRANSFORMER/etched@5.0.0/gg.moonflower.etched.common.sound.download.SoundCloudSource.resolveUrl(SoundCloudSource.java:97) ~[etched-5.0.0.jar%23455!/:?] {re:classloading}
	at TRANSFORMER/etched@5.0.0/gg.moonflower.etched.common.sound.download.SoundCloudSource.resolveUrl(SoundCloudSource.java:28) ~[etched-5.0.0.jar%23455!/:?] {re:classloading}
	at TRANSFORMER/etched@5.0.0/gg.moonflower.etched.api.sound.download.SoundSourceManager.lambda$getAudioSource$3(SoundSourceManager.java:74) ~[etched-5.0.0.jar%23455!/:?] {re:classloading}
... 4 more

The URL is valid and is available on my region, it can be played in a regular browser.
SoundCloud might have changed their API to curb automated access, maybe to mitigate AI abuse like other platforms had.

[AlbusRex]

The link from the example has been removed by SoundCloud, no longer making it a useful data point.
There is however a possible external cause for the disks that fail to load, all download failure incidents reported by players in my server happened during the time windows of La Liga internet mass IP blocks.
I did not think of this at first because there were several dead links in the list (like the one from the logs) as well as some that magically restored themselves the day after and players saw the same end result no matter the reason. After filtering the working links from the dead ones, all reports of music failing to download are concentrated during the mass blocks.
If this is the root cause there is nothing Etched can do about it, It would be helpful if someone else could also observe the same issue on their end.