In PHD, have you clicked on the picture of the camera in bottom left? That allows you to connect the camera and the mount. If using ST4 you will need to select "on camera" as your mount.
Other issue that is occurring to me is if the mount is tracking? IF it is not, then the star will drift. If using EQMOD, select sidereal as your tracking mode. If using the handset, assuming you are aligned, use the handset to point at a target and it will start tracking all by itself.
MAlcolm
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