Hi @K S, Pavan Kumar - the error you're reporting is being returned from your SCIM code into Azure AD. We don't support uploading certificates into our provisioning service. See our documentation on building a SCIM endpoint: https://learn.microsoft.com/en-us/azure/active-directory/app-provisioning/use-scim-to-provision-users-and-groups#building-a-custom-scim-endpoint
As of 1/26/2021, the referenced guidance in that link is:
The SCIM service must have an HTTP address and server authentication certificate of which the root certification authority is one of the following names:
CNNIC
Comodo
CyberTrust
DigiCert
GeoTrust
GlobalSign
Go Daddy
VeriSign
WoSign
DST Root CA X3