Microsoft Graph Update multiTenantOrganizationJoinRequestRecord
Join a multitenant organization, after the owner of the multitenant organization has added your tenant to the multitenant organization as pending. Before a tenant added to a multitenant organization can participate in the multitenant organization, the administrator of the joining tenant must submit a join request. To allow for asynchronous processing, you must wait up to 2 hours before joining a multitenant organization is completed.