To resolve this issue verify the following points:
1. Workflow Rule -
- Go to the Setup ---> Search for "Workflow Rules"
- From the list Select "Send UpdateAccountForm to Client (Managed)" and open.
- Now check if the record matches the criteria of the workflow.
2. Email Alert -
- The Email Alert used in the above workflow has the recipient set as your required emails.
3. Email Template -
- The Email Template used in the email alert is active.
4. Deliverability -
- Go to the Setup.
- Type “Deliverability” in the quick find box and open it.
- Now select Access level as an “All email” and uncheck the checkbox of “Bounce Management (Emails from Salesforce or Email Relay Only)”
- Hit the “Save” button.