On your iPhone or iPad, please follow these steps:
1) Go to the Settings app
2) Click on General
3) Click on Device Management
4) Click on Google Apps Device Policy Payload
5) Click on Remove Management 
6) Go to Gmail (or any Google App that you're receiving the error on)
7) Try to load your business account again - you will be prompted to install a device policy
8) Follow the steps to install the new device policy, and, once complete, log in to the app again
Renew Google Device Policy on iOS Devices
