Hookshot configuration widget fails with odd error

[aine-etke]

Describe the bug

Hookshot configuration widget fails with the following error in UI:

And the following errors in logs (DOMAIN is matrix server's base domain):

WARN 12:01:44:809 [ProvisioningApi] Failed to fetch the server URL for DOMAIN ApiError: API error M_AS_BAD_OPENID: Server is disallowed
    at BridgeWidgetApi.checkIpBlacklist (/usr/bin/matrix-hookshot/node_modules/matrix-appservice-bridge/lib/provisioning/api.js:255:19)
    at async BridgeWidgetApi.postExchangeOpenId (/usr/bin/matrix-hookshot/node_modules/matrix-appservice-bridge/lib/provisioning/api.js:279:17) {
  error: 'Server is disallowed',
  errcode: 'M_AS_BAD_OPENID',
  statusCode: 500,
  additionalContent: {}
}
ERROR 12:01:44:809 [ProvisioningApi] ApiError: API error M_AS_BAD_OPENID: Could not identify server url
    at BridgeWidgetApi.postExchangeOpenId (/usr/bin/matrix-hookshot/node_modules/matrix-appservice-bridge/lib/provisioning/api.js:284:19) {
  error: 'Could not identify server url',
  errcode: 'M_AS_BAD_OPENID',
  statusCode: 500,
  additionalContent: {}
}

To Reproduce My vars.yml file looks like this:

devture_postgres_connection_password: REDACTED
matrix_domain: DOMAIN
matrix_admin: REDACTED
devture_traefik_config_certificatesResolvers_acme_email: REDDACTED
matrix_static_files_file_matrix_support_enabled: yes
matrix_static_files_file_matrix_support_property_m_contacts:
  - matrix_id: REDACTED
    email_address: REDACTED
    role: m.role.admin
matrix_user_creator_users_additional:
 - username: READACTED
   initial_password: REDACTED
   initial_type: admin
matrix_synapse_ext_password_provider_shared_secret_auth_enabled: yes
matrix_synapse_ext_password_provider_shared_secret_auth_shared_secret: REDACTED
matrix_synapse_macaroon_secret_key: READACTED
matrix_synapse_password_config_pepper: READACTED
matrix_coturn_turn_static_auth_secret: REDACTED
matrix_homeserver_generic_secret_key: "{{ matrix_synapse_macaroon_secret_key }}"
matrix_static_files_container_labels_base_domain_enabled: yes
exim_relay_dkim_privkey_contents: REDACTED
matrix_client_element_enabled: yes
matrix_synapse_admin_enabled: yes
matrix_bot_postmoogle_enabled: yes
matrix_bot_postmoogle_password: READACTED
matrix_bot_postmoogle_data_secret: REDACTED
matrix_mautrix_meta_messenger_enabled: yes
matrix_mautrix_gmessages_enabled: yes
matrix_mautrix_googlechat_enabled: yes
matrix_mautrix_meta_instagram_enabled: yes
matrix_beeper_linkedin_enabled: yes
matrix_mautrix_slack_enabled: yes
matrix_hookshot_enabled: yes

1. !hookshot setup-widget
2. Try to open the new widget

Expected behavior

Widget is shown

Matrix Server:

• OS: Ubuntu 22.04.5 LTS
• Architecture: amd64

Additional Context

Freshly installed server, hookshot v5.4.1