Script to send Email alerts on Expiring certificates for Important Certificate Templates

Hi ZohebShaikh . 
Thank you for the script but when executing i am having this error: 

Could you please help! Cheers, Mark

It is failing on the line: 

$Certexpirydate = [datetime](Get-date $importall[$i].'Certificate Expiration Date' -Format $formatdata)

The error I am getting is as follows:
Cannot convert value "28/06/2023 15:04" to type "System.DateTime". Error: "String was not recognized as a valid DateTime."
At line:123 char:6
+ $Certexpirydate = [datetime](Get-date $importall[$i].'Certificat ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [], RuntimeException
+ FullyQualifiedErrorId : InvalidCastParseTargetInvocationWithFormatProvider

Cannot convert value "28/06/2023 15:12" to type "System.DateTime". Error: "String was not recognized as a valid DateTime."
At line:123 char:6
+ $Certexpirydate = [datetime](Get-date $importall[$i].'Certificat ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [], RuntimeException
+ FullyQualifiedErrorId : InvalidCastParseTargetInvocationWithFormatProvider

Cannot convert value "27/10/2023 16:02" to type "System.DateTime". Error: "String was not recognized as a valid DateTime."
At line:123 char:6
+ $Certexpirydate = [datetime](Get-date $importall[$i].'Certificat ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [], RuntimeException
+ FullyQualifiedErrorId : InvalidCastParseTargetInvocationWithFormatProvider