From 19th April 2023, if your organization has an entitlement to it, and has decided that you can have access, you will be able to search for and view confidential product documentation in the Arm Developer documentation hub.
I introduced this in my previous blog: Coming soon: Partner access to confidential technical content.
You will need to have an active Arm Account, which has been verified and validated against your organization, and be logged in to view confidential product documentation.
When you are logged in you will see the following:
You should contact your account manager for further information about how you, or your organization, can opt in to access your confidential technical content.