Create Kunena post on new user registration

RE:  www.joomlapolis.com/forum/professional-members-support/195395-kunena-action-posting-new-registration-cb-fields

Hello,

I just found this post as I was looking for a solution for the same thing. The screenshot was helpful because the concept of CB Auto Actions is in parts too complex for me to figure out on my own.

I set it up so that when a new user registers, a new topic is created in a particular Kunena category. Unfortunately, I must be doing something wrong because it doesn't work.

When creating a test account, I get the following error after submitting the registration form:

0
Kunena\Forum\Libraries\Forum\Category\KunenaCategory::isAuthorised(): Argument #2 ($user) must be of type ?Kunena\Forum\Libraries\User\KunenaUser, int given, called in [...]/libraries/kunena/src/Forum/Category/KunenaCategory.php on line 567

Despite this error, the account is created. The confirmation email is also sent and clicking the link in that email activates the account normally.
But unfortunately, nothing is posted in the forum designated for this.

Here are a few screenshots of what I have set up. Everything else, not in this screenshot, I left untouched:

 

 

Can you please point out where I did something wrong? Thanks!

Likely a Kunena API change that needs to be accounted for in that auto action type. What version of Kunena are you using and on what version of Joomla?