Hi @Chris Gale,
When this problem occurs, have you tried to see if the certificate is created and located in the path which under the path: (local computer\Certificate Enrollment Requests\Certificates)
?
I'm not sure if this is a UI error or conflict that causes the hang, but you could try restarting IIS Manager, or reinstalling it and trying the operation again to see if the certificate can be created correctly.
Best regards,
Xudong Peng
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