Answer by shopOFF for Microsoft Graph Member of limit

You can use query parameters to customize responses - like so for example get the top 300 - this will return til 300 groups etc

https://graph.microsoft.com/v1.0/users/mytestuser@domain.com/memberOf?$top=300

This is a quick and dirty way, since the memberOf method does not support all OData Query Parameters

https://docs.microsoft.com/en-us/graph/query-parameters