Why does establishing a connection to Threema Web fail?
If establishing a connection to Threema Web freezes at 60%, it’s not possible to connect browser and mobile device using WebRTC.
Please make sure you are using the latest version of a compatible browser.
Verify that no browser plugin (such as an ad blocker) is disabling WebRTC, and reload Threema Web.
If you are behind a (corporate) firewall or are using a VPN, Deep Packet Inspection might block WebRTC.