If the test connection and the aggregation are successful, check the names of the attributes you are sending in the provisioning policy and in the source schema.
In the event details, do you have the attribute requests that you are sending ?
Yes, everything is working fine and even provisioning was fine earlier now I am getting this error. I can also see the attributes SailPoint is sending in account activity.
Is it ISC sending from backend? As I am not sending it in CREATE account profile. Also, this issue is with few users. Some accounts are getting created as well.