This article will explain how to fix the error when saving the Chat for JSM project settings, as shown in the screenshot below.
Error: Unable to save "This request is invalid. Check that the request contains all the required parameters and that the parameters are valid. (email: An account already exists for this email)"
Browse https://admin.atlassian.com/ in browser.
Select Products on the top tab.
On the left side panel select the website.
Again, on the left side panel, select Portal-Only customers.
Search for Anonymous Chat User
Select the three Dots (…) and click Grant access
Now you will be able to save the settings on chat for JSM.