Acknowledged

SDK Manager unable to download SDKs or devices

I created a new Garmin account a week ago, but am unable to download any lists or content using SDK Manager.
There are a lot of threads on the recent login issues, but whether initially using version 1.0.6 or now 1.0.8, the error code remains the same.

After logging in and completing the wizard, I end up getting an error 335544xx.
Could it be related to using an HTTP proxy? When logging in to the web portal, I occasionally had to fill in a captcha.

I tried two different systems:
Windows 10 Pro (22H2) -> Error 33554437
Windows 11 Pro -> Error 33554438

The output isn't exactly helpful. Aren't there any logs to get any details on what's wrong?