beacon_initial_calibration issue

Now I have the next problem:
While proceeding the homing sequence with beacon_initial_calibration the printer first homes Y (ok) - the X-Axis moves back and rests in the middle - then X T0 (ok) and X T1 (ok).
Both toolheads rest on their oozeguard parts. When now the bed is homing, it moves upwards, but can't get in contact with the beacon module as it rests "outside". So the motors now chatter on the top ...
As I read in another post, T0 should move in the middle of the printbed, but it doesn't on my printer
What do I make wrong?
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