Hi guys, I actually had this same and very frustrating issue, but found a resolution. This has to do with SoundCloud and Denon not properly syncing and not allowing the user to access Soundcloud settings. While unconventional, it works:
Download the 1.5.2 version firmware and update (most likely a downgrade for people) your device.
Once it’s updated, try the same method of logging into your soundcloud account. For some reason it allowed me in despite my Soundcloud account no longer synced with Denon.
More importantly, this provided me access to the settings cog on the bottom left. Log out of your current and faulty account.
Sign in with your new/updated Soundcloud account
Update your firmware to the latest version. All should be fine now.
From what I find online, you can try downgrading to the 1.6.0 version and see if that works instead. Try that, should be harmless.
If you have a Denon 4 Prime or something else, the Info File shows other devices 1.5.2 does work for these units. To be safe, you can confirm with a Denon rep and double check if this ok/safe.
I have similar problem had to reset my password on soundcloud and now my prime4 dont let me connect to it I when thru support and they told me to reset all my settings, didn’t work so now hope to get a fix on the next version is been a few months since this happened and I dont get any answers from support my last email was june 2 now we are on September 15 and still waiting going to have to cancel soundcloud subscription dont like to pay for something i cant use, also I had weird stuff happening with engine it deleted a crate and move all my music to another crate by it self so now my prime4 and engine dont match is very scary