I think BanjoWind question was implying that the user is not a spellcaster since the items allows anyone to attune to it. In that case I also would like an official explaination but IMO you should be using the save dc for the Enspelled Staff with a spell of 5th level (as telekinesis), so DC 17 is my answer
What is the DC for using telekinesis on creatures?
your own
Like... at will?
I think BanjoWind question was implying that the user is not a spellcaster since the items allows anyone to attune to it. In that case I also would like an official explaination but IMO you should be using the save dc for the Enspelled Staff with a spell of 5th level (as telekinesis), so DC 17 is my answer
It doesn't specify a number of uses, so I would say yes, at will
This explains spell DCs for magic items:
https://www.dndbeyond.com/sources/dnd/dmg-2024/treasure#SpellsCastfromItems