If the 5070 is the Celeron version, and only has 2 Display ports, then it only supports two displays. The 5070 with Pentium has 3 Display ports, and supports 3 displays.  
Hi, we have around 200 wyse 5070 in use, one of my users wishes to use 3 screens. I did not have any problems with 2 screens but the third screen via a usbc to dvi adapter disables the second screen attached via displayport as soon as it's plugged in. That screen then works but it obviously misses the goal. Is it the adapter? Did someone get this to work and is willing to share a sample config? Basic WMS not cloud Device TypeWyse 5070 Celeron OSVersionWin 10 Enterprise LTSC Image Version10.04.06.08.21.00 CentreAgent Version14.5.0.22   Thank You
Wyse 5070 tripple monitor