Guidance is provided for each OS. Please confirm the following.
Android
Is it compatible with Google Play Store?
Devices not compatible with the Google Play Store are not supported by Teachme Biz.
Related:
System Requirements
Is the linkage between the Google account and the device properly set?
Improper linkage between the Google account and the device may cause slow downloads or errors.
Please check with your company's information system department or Google support about the sync status of the account and device.
iOS/Android
Is the download operation of the app prohibited by security settings?
Your company's security settings may restrict the use of the Google Play Store and the download and installation of applications.
Please check with your company's information system department.
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Related:
Confirm the following before purchasing Android devices in bulk or starting business use