Hi @adam900331 ,
Simply run Get-ExchangeCertificate on Edge server.
This self-signed certificate will be used for EdgeSubscription.
If you want to renew the certificate, this article may help you: SMTP certificate renewal and EDGE subscription
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
Regards,
Lou
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.