If you have already consented to permissions for a specific application, the consent flow will not appear anymore for users covered by that consent. The only way to trigger the consent flow is to remove the existing consent. You can do that in Azure AD under Enterprise Applications.Example: A Microsoft 365 Admin has consented to specific admin permissions for the officeatwork Admin Center without activating the checkbox for consenting on behalf of all users. The only way for the Admin to fix this and consent for all users is to remove the permissions already granted by removing the application registration in Enterprise applications in his Azure AD. Once the application registration has been removed, all users, including the admin, will see consent flows for any missing permission. That way, an admin can now activate the checkbox for consenting on behalf of all users.