Avantus by Xactus uses two different gateways (Technical Affiliates) when communicating with Freddie Mac to provide them with the credit report. The two are either Equifax OR Sharper Lending. Admins can confirm which affiliate the account is set with and please ensure that if each user uses their own credentials everyone at the company is set to the same technical affiliate.
See the below walk-through on how to access the credit vendors in the company settings to ensure you are using the right choice based on what the credit vendor has indicated.