Users already invited as "Customers" (so they are showing in the organisation directory) are being prompted to create an account when they try and use the project portal to log an issue for the first time.
I appreciate why this might happen if a user tries to use the portal who has no account in Jira, but these are people that exist already and have the Customer product role.
Should they also be showing in the People and Access section of the project settings with the Service Desk Customers role?