I actually needed to access some of my savings today, helpfully Monzo support were able to transfer the money for me from my savings to my current account.
If your device doesn’t have internet access (or access, but very slow), you’ll see this message along with others. If the internet connection is OK and reasonably fast then it could be an issue with the configuration of your specific device. Randon issues are often fixed with the uninstall/reboot/reinstall dance :