I am having issues with Salesforce not rendering the form fields to send an email from both the activity composer as well as the global action. I am system admin profile so I have the send email permission. I am working from a Professional edition but I don't think that would affect the ability to send an email. Im not sure what setting I am missing to not show this email form.
Additional Confirmed Setup Options: - Email Deliverability: All Email - Enhanced Email: enabled - Email quick action added to page layout