SCIM: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

Hi, I am using the OI 9.0 LTS version and I want to authenticate using Certificate-based authentication in the SCIM connector in the Sync Editor. After I fill in all the connection info, I get the below error message in the part of "Test connection"

"Index was out of range. Must be non-negative and less than the size of the collection.

Parameter name: index"

Does anyone have seen something similar? Thank you