[Bug 1859562] [NEW] Polari doesn't join any chatroom. 'Join' button stays greyed-out (disabled)

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I'm trying to use Polari IRC app on Ubuntu 20.04 (in virtualbox). I'm
not able to join any chatroom because the 'Join' button stays greyed out
when a chatroom is selected. This is same for any server/chatroom I
could check. Screenshot attached.

If I run polari from terminal, I get following error.

svinoba at focal:~$ polari

(polari:21203): Gjs-WARNING **: 16:31:29.656: JS ERROR: TelepathyGLib.Error: 
_onRowActivated/<@resource:///org/gnome/Polari/js/connections.js:216:27
main at resource:///org/gnome/Polari/js/main.js:63:12
run at resource:///org/gnome/gjs/modules/package.js:222:12
start at resource:///org/gnome/gjs/modules/package.js:206:5
@<main>:1:1

However, if I search for telepathy and glib combination, I get
following.

gir1.2-telepathyglib-0.12/focal,now 0.24.1-2 amd64 [installed,automatic]
  GLib Telepathy connection manager library (GObject-Introspection)

libtelepathy-glib0/focal,now 0.24.1-2 amd64 [installed,automatic]
  Telepathy framework - GLib library

Polari works fine on Ubuntu 18.04, Debian Sid and Arch. Haven't tried in
Ubuntu 19.10, although the package version in 19.10 seems same as 20.04.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: polari 3.34.0-1
ProcVersionSignature: Ubuntu 5.0.0-37.40~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-37-generic x86_64
ApportVersion: 2.20.11-0ubuntu15
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 14 09:48:34 2020
InstallationDate: Installed on 2019-08-14 (152 days ago)
InstallationMedia: Ubuntu-MATE 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
SourcePackage: polari
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: telepathy-mission-control-5 (Ubuntu)
     Importance: Low
         Status: Fix Released


** Tags: amd64 apport-bug champagne focal
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Polari doesn't join any chatroom. 'Join' button stays greyed-out (disabled)
https://bugs.launchpad.net/bugs/1859562
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