Group
A "Group" refers to the dedicated usage environment for each company in Teachme Biz.
One group is created per contract.

Group Number
A number that identifies the environment (group) for each contract.
This is set automatically and cannot be changed.
Group Name
The name of the environment (group) for each contract, used when logging in.
This is set automatically at the time of contract, but can be changed to any name of your choice.
※ A group name that already exists cannot be used.
Related:
Manage group information (Web Browser)
https://teachme.jp/8/manuals/4929552/
※ Only administrators can make changes to this information.
What characters can be used in login information (group name, account name, password)?
https://help.teachme.jp/hc/en-us/articles/900005508446
Group Display Name
The display name of the environment (group) for each contract, shown on screen.
This is not set at the time of contract, but can be changed to any name of your choice.
Related:
Manage group information (Web Browser)
https://teachme.jp/8/manuals/4929552/
※ Only administrators can make changes to this information.