When my app issue a token on behalf of a customer, it gave me error message saying invalid session id. This happens 3 out of 10 customers. Then, I asked my customer to do the same thing after he/she access my office desktop remotely and it did work like a charm. From the difference between failed and success cases, I suspect that this could be from different network provider so that session id becomes void due to some kind of network issue. Nevertheless, I'd like to know if this is a known issue and there is a better workaround. Please, get me your help. Thanks. By the way, I went through API call use report since January 1, 2019. I see it start showing this failure in FetchToken operation from February 17. It seems to be an issue in ebay API. Need ebay api team's attention.