Invalid Username????

When attempting to login to the app on my mac my username is not deemed valid but when logging on through a web browser it’s perfectly fine. I’d use the browser but being that I’m currently located in China I can’t use the captcha to validate my account. So there’s no way for me to access my messages although I still get notifications when I get a new message……complete B.S.

Goddess C. about TextNow - Free Text : Free Texting Picture Messaging and Phone Number