Agent Workspace / Workspace Error - Compose Email UI action opens up a blank page.
Incorrect configuration in the sys_aw_renderer table.
Every sys_email record should be accompanied by a sys_email_draft record.
In the below example for the renderer: sn-email-client-wrapper there are 2 records .
Hence if you want to change the email renderer to 'sn_email_editor' , you need to add two records in similar fashion to compose email work properly.