This domain tries to look like it belongs to DocuSign's security team, but the evidence says otherwise. A legitimate company handling security updates would tell you who they are, where they are based, and what their privacy practices look like. This site does none of those things.
The domain registration is completely hidden, meaning whoever set it up does not want to be identified. That alone is unusual for a business, but for a site that asks you to take actions related to security — possibly entering credentials or downloading software — it is a serious warning sign. There is no track record online, no archived history, and no way to verify the organization behind it.
If you are wondering whether docusign.securityupdate.help is a scam, the safest answer is to treat it as one. Real security updates from DocuSign come from their official domain (docusign.com) and are accompanied by clear company information and support channels. This site is a lookalike with nothing behind it but a server and an obfuscated owner.