These shields don’t work with some types of switches. The “wall sockets” at your university will be wired back to switches, which may be the issue.
This thread has more info:
https://community.blynk.cc/t/ethernet-shield-w5100-does-not-connect-to-the-blynk-server-via-switch-only-with-router/12695/26
You may also find that the university’s IT department block some ports that Blynk requires to operate.
You could try plugging a different type of switch into the wall socket and see if that helps.
Pete.