TPU needs a good filament drive that has no place for the filament to go but into the hot end, direct drive does not make it so..
you should have a .5mm nozzle at the very smallest
You can not tighten the tension screw too tight of the filament will become flat and jam in the extruder housing
You can not use much if any retraction
You must go slow 7-10mm second
Temp should be at the low end of their scale
If you used ABS you will need to clean that nozzle with cleaning filament first and flush it with a lot of TPU after.
Feed rate to flush needs go be very very slow..
Good luck,
Oh and the most important thing.. filament must be gravity fed, in other words .. the drive can not be expected to pull the filament and make the real of filament move..