In principle, this cannot be done.
Teachme Biz can only register one authentication service (IdP) information.
Therefore, one Teachme Biz group can only establish SSO integration with one IdP.
Additional Information
Technically, multiple IdPs can be linked on the IdP side, but operation cannot be guaranteed in such cases.
Thorough testing in advance is necessary when implementing this configuration.
For temporary groups needed for testing purposes, contact our support team.
Related: Which services (IdPs) can be connected with Single Sign-On (SSO)?
https://help.teachme.jp/hc/en-us/articles/900006441703