This post is over a year old, some of this information may be out of date.
Getting to know to which Office 365 groups users are a member of, is very useful information. You can use this information for building your own group applications or to keep a record where users have access to (governance / guest access).
The way to retrieve the groups is already documented in the Microsoft Graph documentation, but it is a bit hidden and deserves more attention.
Microsoft Graph documentation: https://graph.microsoft.io/en-us/docs - look for: GET unified groups I’m member of.
Office 365 Groups I am a member of
If you want to know the groups you are a member of. You can call the following API:
Based on the following article: Office 365 Groups REST API. There is an easier way to get the groups where you are a member of:
Info: At the moment, I have not found any reference to this endpoint in the documentation (only on the relationships list of the user: relationships) and it seems that it is already available on v1.0.
Office 365 Groups where the user is a member of
If you want to know to which groups a user is a member of, you can only make use of the memberOf endpoint. The endpoint to call is: