If you face any error when you try to join chat room yahoo messenger, such as your request join room been refused, you might need to read Chat Rules First and comply all the rules given by Yahoo. Below I give you the Chat Rules of Yahoo Messenger:Yahoo! Community GuidelinesJust like any other community, Yahoo! communities include people from a wide variety of experiences, backgrounds, and mindsets. We take pride in the fact that our communities give this diversity of membership an interesting place to interact, share, learn, and grow. In keeping with this spirit of community, we have a core set of principles that must be followed by all members:1. Use must comply with all applicable local, state, and federal rules, regulations, and laws.2. Do not post content protected by any intellectual property rights, including but not limited to copyright, trademark, or other proprietary rights, without permission from the owner.3. Adult content is permitted only in areas marked ‘adult’. You must be 18 years or older to access these areas.4. Participation in all communities is subject to the Yahoo! Terms of Service.5. For specific rules, refer to the community guidelines of the service you are using – however nothing found elsewhere may override these basic principles.Yahoo! does not edit content posted in our communities. Yahoo! may, in our sole discretion, take action against users who post material or engage in activity that violates these principles or the Terms of Service or is otherwise objectionable. Such action may include , without notice, termination of your Yahoo! ID and everything associated with it, including email accounts, groups, posts, pages, and profiles.If you not comply with one of the rules given by YM, that why you been reject or banned by Yahoo to Join Chat Room Yahoo Messenger. Please Comply it first then try to join Room again.