Salesforce release version = 54.0 (Spring 22)
I had a similar question to Unable to send emails from sandbox but this question was more generic.
My workflow involved automatically triggering the submit for approval sending email alert for approval request on the Opportunity level. Then sending back 2 more email alerts when Approving/Rejecting the Opportunity.
Happy flow : When I test the end-to-end workflow with my own Admin username, I am able to get all 3 email alerts.
Problem : When I test as a test user, I only can get the email alert for submitting the approval but not when approving or rejecting the Opportunity.
Checking Unable to send emails from sandbox I also enabled Deliverability = All Email. So what is happening here? And downloading email logs, I couldn't make sense of any of it.