SCCM EP service graph connector.

When the mid server field is empty and the job can’t run, review the following information:

Looking at the Scheduled Data Import Here:
https://yaledevelopment.service-now.com/now/nav/ui/classic/params/target/scheduled_import_set.do%3Fsys_id%3Dcb6a5fdb97868d5012347ea3f153af70%26sysparm_record_target%3Dscheduled_import_set%26sysparm_record_row%3D11%26sysparm_record_rows%3D11%26sysparm_record_list%3Ddata_source.nameCONTAINSep-sg-sccm%255EORDERBYorder

There is a Pre script running. See Here:
https://yaledevelopment.service-now.com/now/nav/ui/classic/params/target/sys_script_include.do%3Fsys_id%3D174a7a0153f0301095e2ddeeff7b12ae%26sysparm_record_target%3Dsys_script_include%26sysparm_record_row%3D1%26sysparm_record_rows%3D1%26sysparm_record_list%3DnameCONTAINSSCCMMultiDataSourceUtil%255EORDERBYDESCsys_updated_on

This is setting the mid server based on this record Here:
https://yaledevelopment.service-now.com/sn_sccm_integrate_instance.do?sys_id=8b6a5fdb97868d5012347ea3f153af6b&sysparm_record_target=sn_sccm_integrate_instance&sysparm_record_row=1&sysparm_record_rows=1&sysparm_record_list=connection_alias%3D03066860c7122010b56243ac95c26027%5EORDERBYname

The mid server field is empty so it's clearing out the mid server field on your data source.