I sent an email to support. I received a response that they have discontinued the forums. I am still in shock, and can't believe it.
MyTMMO Members:
Over the past decade we have seen millions of posts and thousands of users in the MyTMMO forums. These forums were built by a company called FuseTalk. About a week ago, we discovered some technical security issues with FuseTalk software and, out of an abundance of caution, decided to take down the forums until we could assess.
We have now finished our assessment and have made a business decision not to restore the MyTMMO forum functionality. We recognize that many of you used the forums on a daily basis and are as sad as we are to see them retired. We did make every effort to find a way to keep them but the reality is the forum's software is significantly dated and does not meet our standards for continued use.
When we first built MyTMMO, there weren't many options for online communities. Today, thankfully, there are many more options available! We are building a new Facebook group that we invite you to join and help keep the discussions going!