C4C to HCI Integration - BusinessPartnerReplication 'to' ERP - Inbound error

Hello,

I have ensured certificates between the HCI and C4C

1.downloaded the certificate from Comm Arrnagement

2.uploaded it in Iflow

However I am getting following error -

check the test connection in Cloud system

and Message monitoring

however under HCI url,cannot see anything under error tile

or failed status

any lead/input is appreciated

thanks in advance