What is a malformed or illegal request?

Your client has issued a malformed or illegal request. Then it’s most likely that you are currently logged in too many Google accounts at the same time using Google Multiple Account Sign-In. In order to log in to MightyText, you will have to reduce the number of active multiple sign-in accounts.

For More Information Please Refer: https://help.mightytext.net/knowledgebase/articles/398753-when-logging-in-error-bad-request-your-client-h