I am getting error while trying to send an agreement through the Adobe Sign App in CRM 365

@Nithin30395176svyv  the x-api-user is the userId or email of API caller using the account or group token in the format userid:{userId} OR email:{email}. If it is not specified, then the caller is inferred from the token.

I am able to replicate the issue you are seeing in Postman by using an invalid email not associated to my companies Adobe Sign console (email does not exist in my companies adobe sign account). See image below.