Apple/iCloud integration "unknown error occurred"

I realise that this isn’t a new issue and I’ve been reading as many posts as I can to try and see how to fix this. I’ve tried creating an app-specific password in my Apple account but this didn’t resolve the issue. I understand that there may be some other things which can work however it seems that they all require coding type stuff and I’m unfortunately not a coder, I only use HA through the web page interface.

If any of the current workarounds can be performed via the web interface, may someone walk me through that please? Many thanks in advance.