Can not Sign SmartThings WebSite

When I want to sign app for clientId。Tip:
For all other integration types (SmartThings Find, Schema, MQTT, or SmartApps) please visit the Developer Workspace
then I click url to sign,but 404 error!

tagging @nayelyz

Hi @fenggaosun if you try on an incognito window, Is the error still happening?