First sorry for my bad English. I am using audacity from 2021. Not often. I am recording music from YouTube and others to listen it even without internet. Audacity worked fine under Windows 10. But I upgraded it to Windows 11, And I can’t recording now I was trying all combinations with Host, Playback Device and Recording Device in Audio Setup. No result.
It is not an Audacity problem, but a Windows (11) problem. The issue are your “privacy” settings in Windows. Allow access to Audacity for using sound.
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You need to choose “WASAPI (loopback)”.
And you need to choose loopback from wherever the sound is coming-out (usually your regular soundcard).
The instructions are for the current version so it will probably look different, choose WASAPI as you host, and (loopback) for your recording device and it should work.
And you might want to upgrade Audacity, especially if you can’t get your current version working.
The post title says the issue is on 3.7.4. IS there a later version than that?
There are a lot of programs/websites that allow you to break the YouTube terms of service and extract the audio or video from a YouTube post that work a lot faster and easier than real-time recording of a stream.
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This is amazing. So many have written. I didn’t expect it. However, the world isn’t so bad. 
I am programmer. Retired. And I have no knowledge about sound, its recording and playback. In my practice, I dealt with ERP. Delphi and C# with databases, mainly MSSQL. And I haven’t knowledge about sound. Recording it and others. So many settings in Audacity are incomprehensible to me. But on Windows 10 everything was OK. On Windows 11 wasn’t. To today. After today’s upgrade of Windows system Audacity records YouTube. For me it means that Microsoft fixed my problem.
So:
To romontschun: Can you write how I can allow access to Audacity for using sound? It seems be very interesting solution. In my Windows 11 operating system I am admin.
To DVDdoug: Seems sorry, I think you misunderstood me. The Recording desktop audio | Audacity Support is interesting but I don’t have such configuration in my Audacity. I have hosts:
and playback devices:
lately I had here two positions. I don’t remember the name of the second one. But now, probably after windows update, is only one. The second is absent and I don’t know why.
and recording devices:
So I checked the recording one by one in these configurations (głośniki means loudspeakers and mikrofon means microphone):
configuration 1
Host: MME
Playback Device: Głośniki (Realtek(R) Audio)
Recording Device: Głośniki (Realtek(R) Audio) (loopback)
configuration 2
Host: MME
Playback Device: Głośniki (Realtek(R) Audio)
Recording Device: Miks stereo (Realtek(R) Audio)
configuration 3
Host: MME
Playback Device: Głośniki (Realtek(R) Audio)
Recording Device: Mikrofon (Realtek(R) Audio)
configuration 4
Host: MME
Playback Device: the second position here
Recording Device: Głośniki (Realtek(R) Audio) (loopback)
configuration 5
Host: MME
Playback Device: the second position here
Recording Device: Miks stereo (Realtek(R) Audio)
configuration 6
Host: MME
Playback Device: the second position here
Recording Device: Mikrofon (Realtek(R) Audio)
configuration 7
Host: Windows DirectSound
Playback Device: Głośniki (Realtek(R) Audio)
Recording Device: Głośniki (Realtek(R) Audio) (loopback)
configuration 8
Host: Windows DirectSound
Playback Device: Głośniki (Realtek(R) Audio)
Recording Device: Miks stereo (Realtek(R) Audio)
configuration 9
Host: Windows DirectSound
Playback Device: Głośniki (Realtek(R) Audio)
Recording Device: Mikrofon (Realtek(R) Audio)
configuration 10
Host: Windows DirectSound
Playback Device: the second position here
Recording Device: Głośniki (Realtek(R) Audio) (loopback)
configuration 11
Host: Windows DirectSound
Playback Device: the second position here
Recording Device: Miks stereo (Realtek(R) Audio)
configuration 12
Host: Windows DirectSound
Playback Device: the second position here
Recording Device: Mikrofon (Realtek(R) Audio)
configuration 13
Host: Windows DirectSound
Playback Device: Głośniki (Realtek(R) Audio)
Recording Device: Głośniki (Realtek(R) Audio) (loopback)
configuration 14
Host: Windows DirectSound
Playback Device: Głośniki (Realtek(R) Audio)
Recording Device: Miks stereo (Realtek(R) Audio)
configuration 15
Host: Windows DirectSound
Playback Device: Głośniki (Realtek(R) Audio)
Recording Device: Mikrofon (Realtek(R) Audio)
configuration 16
Host: Windows DirectSound
Playback Device: the second position here
Recording Device: Głośniki (Realtek(R) Audio) (loopback)
configuration 17
Host: Windows DirectSound
Playback Device: the second position here
Recording Device: Miks stereo (Realtek(R) Audio)
configuration 18
Host: Windows DirectSound
Playback Device: the second position here
Recording Device: Mikrofon (Realtek(R) Audio)
and I couldn’t record in any of them. But, after windows update, I can 
To evilmrb: Big thanks. It’s nice that someone reads with understanding.
To Wrecks0: Problems with Audacity prompted me to look for other solutions. And I found a few of the ones you mentioned. Thanks.
That one should work as long as you only have one soundcard and/or that’s where the sound is coming out.
You’ll only see loopback with WASAPI as the host.
“Loopback” means your recording the soundcard’s output instead of the usual way of recording the input.
Make sure the recording volume slider is turned-up.
And you may have to start playback first. WASAPI can record a silent stream but it can’t record “nothing”.