expo build:ios throws Reason: Unknown reason, raw: "SSL_connect returned=1 errno=0 state=error: certificate verify failed"

This worked for me:

npm install -g expo-cli

https://status.expo.io/incidents/vw27kb523vn7?u=mgkr96ykcctd

Turns out it's a known issue. One of Expo's certificates expired.

My woking solution :

npm install -g expo-cli