It was probably just where Windows 10 hadn't finished uploading all the recorded audio/video of your previous Skype calls to Microsoft's servers yet. So it put Skype in a special mode to where you couldn't be making further calls until all that was finished.
All that data will be reviewed and analyzed for marketing purposes. And probably sold to the highest bidder. I hope you didn't say or do anything private or embarrassing during those calls, lol.
Hey, you agreed to Microsoft's TOS.
