If you're having trouble connecting to an audio/video conversation in Pragli, see if the below points are relevant to you.
Browser Extensions Blocking WebRTC
Certain privacy and VPN extensions block the WebRTC communication protocol that we use in Pragli. Here is a common list of extensions that could be affecting your connection (there are likely way more).
If you have one of these extensions, we recommend that you change the settings for your extension to unblock WebRTC.
As an example, here's the settings page for uBlock Origin where you can change your WebRTC settings.
Note: These extensions block this protocol because there is currently an unresolved security issue in WebRTC where your true IP address can be revealed when using a VPN. This vulnerability is called WebRTC leak.