Sending a new print to the printer.
DSH is parked on T1
T0 is the primary extruder.
DSH will not switch to T0, it stays on T1.
Switching manually works.
Switching during print works (if it starts on the correct tool)
What info do you need from me to troubleshoot?
Could you share your T0/T1 macros. Assuming you are using Klipper. Alternatively you could share your T0/T1 code from your slicer.