Hi @Markus_Blomqvist, thanks for reaching out!
The level of access a Guest have in your Organization will depend on what you have shared with them. In this case I recommend you to contact our support team and share this information:
- email addresses of the Guests that can assign tasks to each other
- URL of an example task that was assigned to a Guest who is not part of the project or team
- URL of this thread so you don’t need to repeat everything
Our support team will be able to have a closer look and give you more specific details about your question.
We also have a great post from our Certified Pro @Bastien_Siebman with some information to understand what Guests can see. You can check it out here: Who sees whom, a guide to guest visibility with Batman & Robin
Let me know if you have any questions!