Issues activating Office 2013 click-to-run clients with Shared Computer Activation

We have an emerging issue where some clients that are using Shared Computer Activation (SCA) on our Office 2013 click-to-run clients cannot sign in. Users are seeing an error similar to this when trying to log in:

“There is a problem with your account. Please try again later.”

The reason is one of the required URLs for SCA is being blocked by some security programs:

http://clientconfig.microsoftonline-p.net/fplist.xml

We are investigating why this particular URL is being flagged to be blocked, but to fix this issue, please work with your networking and security team to ensure that this URL is whitelisted per our documentation of required URLs for Authentication and Identity here:

https://support.office.com/en-us/article/Network-requests-in-Office-365-ProPlus-eb73fcd1-ca88-4d02-a74b-2dd3a9f3364d?ui=en-US&rs=en-US&ad=US