We have identified that the incident is related to an ongoing issue with Salesforce Communities. We are monitoring the status of this issue closely and will update as soon as Salesforce has implemented a fix. As a workaround please use
https://jumpcloud-support.force.com/support/s/ to navigate to knowledge base articles. Embedded links in KB's will still reference the default domain that is impacted, so please independently search for those links or update url to the workaround domain.