dovecot - Apr 2019 - OAuth Passdb Grant

I'm trying to implement the password grant flow, as specified at
https://wiki2.dovecot.org/PasswordDatabase/oauth2,
but am getting an error message. Can you please help?

auth: Fatal: oauth2 /etc/dovecot/dovecot-oauth2.token.conf.ext: Error in
configuration file /etc/dovecot/dovecot-oauth2.token.conf.ext line 1:
Unknown setting: grant_url

$ dovecot -n
# 2.3.5.2 (38c8f1daf): /etc/dovecot/dovecot.conf
# OS: Linux 3.10.0-957.10.1.el7.x86_64 x86_64 CentOS Linux release 7.6.1810
(Core)
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://dovecot.org/pipermail/dovecot/attachments/20190419/1982fb57/attachment.html>

> On 19 April 2019 11:11 Tom via dovecot <dovecot at dovecot.org>
wrote:
> 
> 
> I'm trying to implement the password grant flow, as specified at
https://wiki2.dovecot.org/PasswordDatabase/oauth2,
> but am getting an error message. Can you please help?
> 
> auth: Fatal: oauth2 /etc/dovecot/dovecot-oauth2.token.conf.ext: Error in
configuration file /etc/dovecot/dovecot-oauth2.token.conf.ext line 1: Unknown
setting: grant_url
> 
> $ dovecot -n
> # 2.3.5.2 (38c8f1daf): /etc/dovecot/dovecot.conf
> # OS: Linux 3.10.0-957.10.1.el7.x86_64 x86_64 CentOS Linux release 7.6.1810
(Core)
Hi!

Apologies, the documentation lacked version information. Password grant will be
available on 2.3.6 release.

Aki