Perfect, thanks @nielslange !!
I’m looking for a similar answer to this also. I can see in the FAQs it says ‘To create new guest author profiles, a WordPress user will need the ‘list_users’ capability. This is typically granted to the Administrator role, but can be altered with the ‘coauthors_guest_author_manage_cap’ filter.’ However there is no documentation to explain how to use this filter. Does anyone know?