Are you receiving any error messages when setting up your text-to-join? If so having any screenshot of the error message will allow us to troubleshoot further. Also, what browser are you working in? If you have not yet tried turning on your text-to-join in a different browser or a private/incognito window I would suggest doing so. Are you able to complete the setup through a different browser?
I just wanted to confirm that you saw Frankie's reply above, as you posted again since she left it. Would you be able to elaborate on what, if any, error messages you're receiving or could you provide any screenshots of what you're seeing? This would help us to figure out what is going on. Thank you!