Your experience will differ depending on whether you use a government or non-government network.
Government network
The first time you use SSO, you might be asked to enter your Microsoft Office365 account details.
On subsequent visits, you'll be taken directly to the service you’re logging in to (unless you clear cookies or browser history, use a different computer, or log out of your Office365 account).
Non-government network (or using Firefox)
SSO can be used off-network for applications and systems that are available off-network (e.g. For government). It doesn't give you access off-network to systems and applications available only on the government network (e.g. Aurion ACE Employee Self Service).
When you use SSO off-network, or via the Firefox web browser, you will be asked to enter your Microsoft Office365 account details on each occasion.