I appreciate the time posting your issue here in the Community Forum. I understand that you have difficulty in accessing web messenger.
I apologize for not answering the issue in a timely manner. I recommend that you optimize and upgrade your browser to make sure that it isn’t contributing to this issue. You can check also the link Fix it as it provides you an initial troubleshooting on the issue.
For additional information, I would like to ask;
Does the issue happen when you are using a different browser or computer?
Have you received any error or default messages? If so, please provide us the exact error message.
Please provide us much more information.