It's very similar that Niantic kicked out Team Rocket GO early in the evening at 19:00. It seems that a specific reason is not known at this time, but until now there have been no known errors. This is a matter of waiting for Niantic's notification of this. Perhaps this is part of the deployment phase, but we hope this will soon become clearer.
Now we have more articles with great information about this new feature:
Now that Team Rocket GO is likely to be off, we have to wait for it to restart. Of course, we will inform you about this in the coming period.