You can not manually manage the users of a team as soon as you have set a OIDC Group name. If you want to manually add / remove users of that team, you need to clear the OIDC Group name field first.
You can automatically add / remove users from / to teams during the login flow of a user. The single source of trough in that case will be your IDP (Identity Provider).
Enter the Group name of your IDP In the OIDC Group name field
Group names are case-sensitive
Specify the piplanning app role which will be assigned to any user of that Group during login
Roles are global. If a user is in more than one group (e.g. groupA and groupB) and the two groups have a different role mapped (groupA=>Member, groupB=>Observer) to them: The user will get the role with the highest privilege (=> Member)