Thank you so much for posting here.
Whatever hash algorithm you choose under the Select the hash algorithm for signing certificates issued by this CA determines how the root CA's own CA certificate is signed and how it will, by default, sign other certificates and CRLs it issues.
Some applications supporting SHA-2 have problems with the larger SHA-2 key sizes, such as SHA-512. For example, TLS 1.2 supports SHA-256 and SHA-384, but not SHA-512.
Here are some relevant links:
For more information, we could refer to:
Implementing SHA-2 in Active Directory Certificate Services
We could kindly have a check of the provided information to evaluate the limitation of SHA 512.
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