You've stumbled upon a Jira or Confluence link that points to the old Server environments. All Jira and Confluence content has moved to the new Cloud environments. Please update your link to point toward the appropriate page on one of the following Cloud environments.
Corp Jira - https://avalara-corp.atlassian.net/jira (most users use this Jira environment)
Confluence - https://avalara.atlassian.net/wiki (most users use this Confluence environment)
Engineering Jira - http://avalara.atlassian.net/ (used by Engineering and Product)
JSM Confluence - https://avalara-corp.atlassian.net/wiki (used by IT and Security)
If you need assistance with this, please contact Emily Krebs.