Hi there! I understand how frustrating it can be when text messages aren’t sending. Let's see if we can get that sorted out for you.

Could you tell me a bit more about the situation? Are you trying to send texts through the AT&T Office@Hand app on your WebKit browser, or are you using another device? Also, are there any error messages that you see when you try to send a message? Any details you provide will help me assist you better!

When I send a text message using the Office@hand on my desktop or mobile device it comes with a message failure to send notification.

Thank you for the additional details! The failure to send notifications when trying to send messages could be related to several factors. Let’s go through a few steps to troubleshoot this issue together:

1. Check Your Internet Connection: Ensure that your desktop or mobile device has a stable internet connection. Try refreshing your browser or restarting the app if you're using it.

2. Verify Contact Information: Sometimes, sending errors can occur if the recipient's number isn't entered correctly. Double-check the number you’re trying to send the message to.

3. Clear Cache and Cookies: If you are using the Office@Hand through a web browser, try clearing your browser's cache and cookies. This can help resolve any temporary data issues.

4. Update Your App/Browser: If you’re using the Office@Hand app, make sure it’s up to date. Having an outdated version of the app can cause sending issues. The same goes for your web browser—ensure it’s the latest version.

5. Account Status: Sometimes, there might be account-related restrictions affecting your ability to send messages. Make sure your account is in good standing with no billing issues.

6. TCR Rejections: If you see an error that relates to TCR (Telecommunications Consumer Residual), it could mean there’s something missing or incorrect in your message submission. You may want to double-check your message content and resend it. More information on this can be found here.

7. Re-register the App: If you've recently changed your phone number or email associated with your account, you may need to re-register the Office@Hand app.

If you’ve tried these steps and are still experiencing issues, please let me know, and we can explore more advanced troubleshooting or see if it might be necessary to check for server outages. Are you satisfied with the solution I provided, or would you like to go further into this issue?