Update certificate-assignment-fails-invalid-characters.md

Edit review per CI 8534

Author: przlplx

Exchange/ExchangeServer/administration/certificate-assignment-fails-invalid-characters.md

@@ -1,7 +1,7 @@
 ---
 title: Certificate assignment fails with error 0xe434352
-description: This article provides the resolution for error 0xe434352 that occurs during certificate assignment when unsupported characters are used in the domain name of Receive Connectors.
-#customer intent: As an Exchange Server admin, I want to resolve certificate binding issues caused by invalid fully-qualified domain names (FQDNs) so that I can maintain system reliability.
+description: This article resolves error 0xe434352 that occurs during certificate assignment if unsupported characters are used in the domain name of Receive Connectors.
+#customer intent: As an Exchange Server administrator, I want to resolve certificate binding issues that are caused by invalid fully-qualified domain names (FQDNs) so that I can maintain system reliability.
 author: cloud-writer
 ms.author: meerak
 manager: dcscontentpm
@@ -20,22 +20,22 @@ search.appverid: MET150
 ms.date: 01/28/2026
 ---
 
-# SMTP certificate assignment fails with error 0xe434352 because of unsupported characters in the FQDN
+# Error 0xe434352 and SMTP certificate assignment fails 
 
 ## Summary
 
-When you assign certificates to Exchange services, you might encounter error 0xe0434352 during the certificate binding process. This error typically indicates that one or more Receive Connectors in your Exchange environment use FQDNs that contain characters that aren't supported by DNS standards.
+When you assign certificates to Exchange services, you might encounter error 0xe0434352 during the certificate binding process. This error typically indicates that one or more Receive Connectors in your Microsoft Exchange Server environment use FQDNs that contain characters that aren't supported by DNS standards.
 
 ## Symptoms
 
-You run the `Enable-ExchangeCertificate` cmdlet to assign a certificate to the SMTP service. The operation fails with the following message:
+You run the `Enable-ExchangeCertificate` cmdlet to assign a certificate to the SMTP service. The operation fails and returns the following error message:
 
+> Unknown error (0xe0434352)
 > The Exchange Certificate operation has failed with an exception on server <*Server Name*>.
-> The error message is: Unknown error (0xe0434352)
 
 ## Cause
 
-This issue occurs when the FQDN of one or more Receive Connectors contains unsupported characters, such as underscores. The connector creation process allows underscores in the domain name, but these characters violate DNS standards and cause failures during certificate binding.
+This issue occurs if the FQDN of one or more Receive Connectors contains unsupported characters, such as underscores. The connector creation process allows unsupported characters, such as underscores, in the domain name. However, these characters violate DNS standards and cause failures during certificate binding.
 
 For more information about domain names, see the following articles:
 
@@ -44,34 +44,32 @@ For more information about domain names, see the following articles:
 
 ## Resolution
 
-To resolve this issue, use the Exchange Management Shell to find connectors with invalid FQDNs.
+To resolve this issue, use the Exchange Management Shell to find connectors that have invalid FQDNs. Run the following Powershell command:
 
 ```powershell
 Get-ReceiveConnector | Select Identity, FQDN  
 ```
 
-You can refine your search to look for specific unsupported characters. The following example searches for underscores in FQDNs.
+You can refine your search to look for specific unsupported characters. The following example searches for underscores in FQDNs:
 
 ```powershell
 Get-ReceiveConnector | Where-Object { $_.FQDN -like "*_*" } | Select Identity, FQDN
 ```
 
-After you identify the connector with unsupported characters, rename it using supported characters to fix the problem.
+After you identify the connector that contains unsupported characters, rename it by using supported characters:
 
 ```powershell
 Set-ReceiveConnector -Identity "ServerName\ConnectorName" -FQDN ValidFQDN.domain.com
 ```
 
-After you fix the domain name, retry the certificate assignment to confirm that you no longer receive the error.
+After you fix the domain name, retry the certificate assignment to verify that you no longer encounter the error:
 
 ```powershell
 Enable-ExchangeCertificate -Thumbprint <Thumbprint> -Services SMTP
 ```
 
 ## References
 
-For more information about domain name formation and supported characters, see:
-
 - DoD Internet host table specification [RFC 952](https://www.rfc-editor.org/rfc/rfc952)
 - Domain names - Implementation and specification [RFC 1035](https://www.rfc-editor.org/rfc/rfc1035)
 - Requirements for Internet hosts - Application and Support [RFC 1123](https://www.rfc-editor.org/rfc/rfc1123)