We are not allowed to photocopy or take pictures of our federal identification or credentials - actually no one is allowed for any federal identification because of federal laws.
Here are three choices. It is up to your comfort level.
You can verify your DCSA investigator through a verification process by either a phone call or an email. Google “how do i verify a DCSA investigator” for the number and email.
You can also ask the investigator for information not generally known from your SCA - I offer this to my Subjects when we have to use the phone instead of video. I’ve had Subjects ask where they lived in a certain period to who are the three listed references.
You can decline the telephone interview and wait until we are allowed back into the field.