Trouble to opening t.co links
It is possible that it has something to do with uBlock. Have you tried disabling the extension temporarily? Try that and see if the problem persists, if it doesn't, then that is your answer. You might just need to whitelist the domain t.co.

If it doesn't solve the problem, then you might need to try something else. Is both your Mac and iOS device on the same WiFi network? There could be a firewall or something blocking the Mac from connecting to the domain, while the iOS device is on cellular data.