Asana is a well-known project management platform used by millions, and cdn.sync.app.asana.com is one of its login subdomains. That means when you see this URL in your browser, you're on an official Asana page, not a copycat or phishing site. The technical setup backs that up: the connection is encrypted with modern TLS, and the site sets multiple security headers to protect against common web attacks. It also publishes a vulnerability disclosure policy, which is a sign that security is taken seriously internally.
From a compliance standpoint, the page links directly to Asana's privacy policy and terms of service — exactly what you need from a service asking for your email or Google/Microsoft account credentials. The domain is served through AWS CloudFront, which matches the infrastructure of other large SaaS companies.
What gives us a little pause is the lack of historical web archive data for this specific subdomain. It's relatively new or hasn't been crawled, so we can't point to a long track record. But that's not unusual for subdomains that serve static assets or login flows, and it doesn't outweigh the strong evidence that this is a legitimate Asana endpoint. If you're logging into your Asana account, cdn.sync.app.asana.com is the right place. There's no reason to treat this as a scam.