Have you seen https://deploymentresearch.com/moving-the-configmgr-current-branch-database-to-another-server-as-in-back-to-the-primary-site-server/?
Move SCCM DB and SUSDB to Different instance

Hi,
We've SCCM Primary Site CB 1902 and its databases hosted on a clustered SQL server, we are planning to move SUSDB and CM DB from default instance (MSSQLSERVER) to new Instance on the same cluster.
so please I need the sequence should I follow to perform this task
Thanks in advance
4 answers
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AllenLiu-MSFT 24,291 Reputation points Microsoft Vendor
2020-08-25T02:27:26.99+00:00 Hi,
We can move the site database to a new instance of SQL Server on the same computer, or to a different computer that runs a supported version of SQL Server.
Run Configuration Manager setup on the site server, and select the option Perform site maintenance or reset this site. Then select the Modify SQL Server configuration option. Then we can change instance of SQL Server.
Note when we move the database to a new instance on SQL Server, we need to enable common language runtime (CLR) integration. Use SQL Server Management Studio to connect to the instance of SQL Server that hosts the site database. Then run the following stored procedure as a query: sp_configure 'clr enabled',1; reconfigureHere is the documentation and the precautions:
https://learn.microsoft.com/en-us/mem/configmgr/core/servers/manage/modify-your-infrastructure#bkmk_dbconfig
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Ahmed Essam 196 Reputation points2020-09-02T07:25:34.697+00:00 Hi Allen and Jason
Thanks for your help
I followed the steps to move to CM database from default instance to another instance (Always On)
when I try to modify SQL configuration using SCCM setup wizard which is located in cd.latest, I get the below errors
ERROR: SQL Server error: [08001][-2146893019][Microsoft][SQL Server Native Client 11.0]SSL Provider: The certificate chain was issued by an authority that is not trusted.
i found a certificate named with the SQL instance name in the Trusted People folder in sccm server
Thanks
AllenLiu-MSFT 24,291 Reputation points Microsoft Vendor2020-09-07T02:00:49.76+00:00 @Ahmed Essam
Your SQL is clustered, so you may need to check which certificate is being used follow the steps.
You may refer to the last reply of the thread:
https://social.technet.microsoft.com/Forums/en-US/a96b7ba6-32cc-4ceb-a1e0-b0952d5a134d/sccm-2012-db-migration-certificate-chain-error?forum=configmanagermigration
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