I've found that many users have experienced the same problem, and the possible root cause could be the massive number of users accessing this new platform and the chat as well. Because of this, a number of users have noticed this unexpected error.
I recommend that you provide feedback and suggestions through the Microsoft feedback portal:
https://feedbackportal.microsoft.com/feedback/f...
And just to avoid any misunderstanding, please note this is an open forum for user-to-user support. Staff members of Microsoft Support do not manage this forum. Everybody in this place is assisting one another. Users of this forum are not employees of Microsoft, and we have no influence on its policies, operations, or data.