Using Turbotax Buiness Incorpoated 2018. Will not complete the Netfile process

Turbotax Business Incorporated 2018 T2 Return File and after checking all audit messages, software says ready to file.  Called CRA and got Access Code.  Input access code, file will not transmit.  Called CRA and they advised the access code number we input is correct.  Been trying late last week and again today to netfile return.  CRA website is rejecting the return.  Shut off firewall in event that was stopping return from transmitting, it still will not transmit.  I am at wits end.  There is no telephone number to call for technical support that I could find.  Any ideas what to try next?