In November 2020, Adobe Sign changed their Domain Name.
You should have received an email from Adobe Sign about the change. The Adobe Sign email includes a link to their Migrating from echosign.com to adobesign.com FAQ on what to do:
In order to ensure that all links from FYI to Adobe Sign function correctly with their domain name change, make sure you follow all the steps for updating your Adobe Sign Account Settings as detailed in the Adobe Sign FAQ as soon as possible.
No changes are needed to your Adobe Sign Settings in FYI.