How to Revert user with Licensed Account back to Customer Portal Access Only

[Deleted user]

Is there a way to revert a user with an Atlassian account back to having customer portal access only when both are based on the same email? (i.e. user submitted tickets through customer portal from an email address, and later I gave user Atlassian access separately via the same email) -- this caused a whole slew of problems, so I'm wondering if there's a way to undo...

The initial problem I had is based off of ticket below, and I want to know if there's a way to undo giving them the Atlassian access.

https://jira.atlassian.com/browse/ID-7151

[Deleted user · Accepted solution]

Solution: Merged the user accounts and created a project role that gives them view only access to the boards that they need to see issues on

[Troy Anderson]

This isn't really a solution.  They should not need access to JSM and can view their issues in the Portal.

[Connor]

Would it be possible to remove them completely from your organization, and then recreate their portal only account?