Maximum number of slides that can be imported from Powerpoint to Storyline 360

I am failing to import Powerpoint 365 slides into Storyline (from Articulate 360 1.42.22691.0) using a Windows 10 laptop.

I have also got my Office365 reinstalled and earlier today Storyline was also updated. I get the same error (see attachment) if I import 202 slides or  10 slides. Any help will be appreciated.

I have tried to import slides using 2 methods:

1- New project - import Powerpoint

2- Import.....(directly from home screen)

Both give same results or get stuck in a loop.