IMAP email not being received - webklex-imap

[glennmuk]

KrayinCRM - Version 2.1.2

NO IMAP EMAIL RECEIVED
After setting up my IMAP settings in both the .env file and also Configuration --> IMAP Settings, I cannot receive any email.
Note: I can send email OK via smtp.

In the .env file - I have set:
MAIL_RECEIVER_DRIVER=webklex-imap
IMAP_HOST=mail.hostname.com (example)
IMAP_PORT=993
IMAP_ENCRYPTION=ssl
IMAP_VALIDATE_CERT=true
IMAP_USERNAME=myEmail@email.com (example)
IMAP_PASSWORD=myEmailPassword (example)

Also, in my application via my admin login - Configuration --> IMAP Settings in the application, I have also set the following:
Host - mail.hostname.com (example)
Port - 993
Encryption Type - ssl
Validate SSL Certificate - true
IMAP Username - myEmail@email.com (example)
IMAP Password - myEmailPassword (example)

What other settings should I be updating?

I cannot receive any email.

Expected result: Email should be received.