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1.Please help check if there is any stuck .OPA file in \Microsoft Configuration Manager\inboxes\objmgr.box? If yes, please delete the file to have a try. Similar thread for your reference:
SMS_Object_Replication_Manager Critical. Any help very welcome!
2.Maybe the version of client is lower and you need to update the SQL Server Native Client to fully support TLS 1.2. Here is a helpful articles about the SQL Server Native Client Update Warning for your reference:
SCCM 1810 SQL Server Native Client Update Warning Prerequisite
Microsoft® SQL Server® 2012 Native Client - QFE
Hope my answer could help you. Thanks for your time.
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