Bottom bracket help

[Stravakiddo]

I have two powermeters Magene, one on my roadbike and the second one I bought for another project that is actually suspended. I wanna use it on my MTB but the axle is a bit short (a few millimeters). So the Magene crank would not fit, I also tried the Shimano direct mount but cant fit either.
Any solution how to adapt this damn powermeters? Do you know if there are any kind of bottom bracket with narrow cups? Or if I can adapt it in another way?

[SillyMochi]

Since Magene (I assume PES 505/515 Base?) is a road crankset, I doubt you can fit it on any "normal" MTB. What BB type is your bike?

[Stravakiddo]

Since Magene (I assume PES 505/515 Base?) is a road crankset, I doubt you can fit it on any "normal" MTB. What BB type is your bike?

My MTB it is a Cannondale trail 5 2021 (no boost).
The bb type is bb68(?)