Correct, I am using that plugin.
The loop is working, but not any import.
the problem seems that there are already 921 instagram posts (from user1)
that import *the initial one* was working flawlessly.

Now I am finished with one user, and I need to switch to the 2nd user cause in that account I have also around 500 instagram posts which I have to import before I can make a selection what I do not need.

I delete the information from the keyring from that user, than I add the info from user2, I have also made credentials/secrets under that account on the developer site of instagram. I am authenticated .. now I press import
but still 0 images to be imported.

(unfortunately) .. ;_)