To benefit the community, just following-up from the comments discussion.
Group calls are supported in the calling SDK (hope you're not leveraging calling UI SDK). 1:1, Group Calling and Teams Interop works for both iOS and Android.
1:1, Group Calling and Teams Interop works for both iOS and Android the Docs are worded incorrectly. Thanks again for your feedback on the doc. I have shared the feedback with our content for adding more clarity.