SSO in Azure doesn't work for the test users from the free Microsoft 365 Developer Program

Hi, I have made an integration of SAP S/4HANA Public Cloud with Microsoft MS Teams functionalities: share as a Tab and share a Card. When the link is sent from the main account, which I used while configurating the Microsoft 365 Developer Program, SSO with SAP BTP works correctly. If I am logged with some of the test accounts, the SSO doesn't work. The roles in Azure are the same, the Application CIS was also assigned to all the users. Other then that everything works fine. Could you please help with that?