If your ArriveCAN app is stuck on the message "Please wait while your ArriveCAN traveller is saved", follow these steps to troubleshoot and resolve the issue:

1. Check Internet Connection: Ensure that you have a stable internet connection. Poor connectivity can cause the app to hang. You can try disabling and then re-enabling your mobile data or Wi-Fi.

2. Restart the App: Force stop the ArriveCAN app and then restart it. To do this, go to your device settings, find the ArriveCAN app, and select "Force Stop". After that, open the app again.

3. Clear App Cache: Clearing the cached data can help fix bugs. Go to Settings > Apps > ArriveCAN > Storage, and then select "Clear Cache". This action will not delete any of your personal data.

4. Update the App: Ensure that you are using the latest version of ArriveCAN. Go to the Google Play Store, search for the ArriveCAN app, and see if there’s an update available. If there is, install it.

5. Reboot Your Device: Restarting your device can help in clearing temporary glitches. Press and hold the power button on your device and select "Reboot".

6. Try Again Later: Sometimes, server issues with the ArriveCAN platform can cause delays. If the problem persists, wait for some time and try to save your traveller profile again later.

7. Contact Support: If none of these steps work, consider reaching out to ArriveCAN support. You can find their help topics on their official website learn more.

By following these steps, you should be able to troubleshoot and potentially resolve the issue with the ArriveCAN app being stuck.