Currently we only support the management of on-prem groups via the self-service portal as described in the article below:
How To: Add 'My Managed Resources' to Self-Administration Web Interface (135371)
An enhancement request (TF00229846) has been created detailing the feature: introduce the management of Office 365 groups via the self-service portal (My Managed Resources).
The product team will evaluate the request and this feature may become available on a future release of the product.
Please refer to this article for updates or contact support referencing the Enhancement Request ID: TF00229846.