Here are what I found in your website:
1) There are missing steps, you did not add those custom PHP codes into your website according to that document
2) There is a compatibility problem in your website, you are using three "Ultimate Member" plugins, those plugin will take over WordPress author archive page, and make the custom shortcode [get_author_id_in_archive] not working.
I have done below modifications in your website:
1) Deactivate those three "Ultimate Member" plugins
2) Add the custom PHP codes for shortcode [get_author_id_in_archive] here:
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click tab "Custom Code", you should be able see item "get_author_id_in_archive", same as that document, setup with below codes:
function get_author_id_in_archive_func($atts) {
$author_id = 0;
if (is_author()){
$author = get_queried_object();
$author_id = $author->ID;
}
return $author_id;
}
add_shortcode("get_author_id_in_archive", "get_author_id_in_archive_func");
3) Create two pages:
a) Inbox
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with the same codes according to that document:
[toolset_access role="Guest" operator="allow"]
Message for guests
[/toolset_access]
[toolset_access role="Guest" operator="deny"]
[wpv-view name="Messages received" info="[wpv-current-user info='id']"]
[/toolset_access]
b) Outbox:
hidden link
with the same codes according to that document:
[toolset_access role="Guest" operator="allow"]
Message for guests
[/toolset_access]
[toolset_access role="Guest" operator="deny"]
[wpv-view name="Messages sent"]
<div class="wp-block-toolset-cred-form">[cred-form form="new-message" ]</div>
[/toolset_access]
Although there are lots of steps not finished, but we can test it now:
1) In author archive page, for example:
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You should be able to see a post form "Contact author":
fill and submit that form,
2) then user "toolsetsupport" will see the new message in "inbox" page:
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And user "toolsetsupport" can reply the message
3) And you will be able to see those sent message in outbox page:
hidden link
As I mentioned above, there are still steps not finished, you will need to setup them according the document:
https://toolset.com/2018/11/introducing-toolsets-communication-system-for-professional-listing-sites/
