Guest not joining room with guest access

[matrixbot]

This issue was originally created by @Gredin67 at matrix-org/dendrite#3163.

Background information

• 0.13.1:
• ** Postgres**:
• debian yunohost https://github.com/YunoHost-Apps/dendrite_ynh/:
• go version 1.20:
• Element Web:

Description

I can register as guest from Element, but cannot join room #guest-room:homeserver.tld that is public and has guest access activated. Here is an extract of my dendrite.yaml:

  registration_disabled:     False
  guests_disabled:   False
  registration_shared_secret:  xxxxxxxxxxxxx
  enable_registration_captcha: true
  # Settings for ReCAPTCHA.
  recaptcha_public_key: "xxxxxxxxx"
  recaptcha_private_key: "xxxxxxxxxx"
  #recaptcha_bypass_secret: ""
  #recaptcha_siteverify_api: ""

  # To use hcaptcha.com instead of ReCAPTCHA, set the following parameters, otherwise just keep them empty.
  recaptcha_siteverify_api: "https://hcaptcha.com/siteverify"
  recaptcha_api_js_url: "https://js.hcaptcha.com/1/api.js"
  recaptcha_form_field: "h-captcha-response"
  recaptcha_sitekey_class: "h-captcha"
  auto_join_rooms:
    - "#guest-room:homeserver.tld"

in synapse, to be able to access a room as guest, this room should be listed in auto_join_room and followinf setting should be set auto_join_rooms_for_guests: true.

Could this be related ?

[matrixbot]

This comment was originally posted by @syui at matrix-org/dendrite#3163 (comment).

Is it possible for dendrite to preview public rooms as a guest?
I've tried various settings but it doesn't work.

https://git.hack-hro.de/grouprise/grouprise/-/issues/731
element-hq/element-web#24513