I am by no means an IT specialist but got Error 502 when attempting to log in.
What is of particular interest is the URL on the website that I was directed to: accounting.sageone.co.za/dashboard/detectFlash.aspx
Flash ??
Maybe herein lies the issue and Sage have been caught with their pants down and were still using flash in their software after the 31st December 2020 (I personally have known for over two years that Flash was no longer supported from the end of the year).
If this is indeed the case then Sage deserves everything coming their way........