Hi, @yehorvoronov!
The “Your connection is not private” warning and the specific error messages you’re encountering, such as handshake_failure, are related to SSL/TLS (Secure Sockets Layer/Transport Layer Security) configurations on your server. These issues typically arise when there is a mismatch between the TLS protocols and cipher suites supported by your server and those supported by the older browsers and devices.
Is your DNS with Vercel?
Sharing some related documentation that might be helpful: