I noticed only group admins on element.io can start video/voice group calls, and then I look on the group settings to find out which role is the one granting permissions to start such calls, but none of the roles seem to correspond to that. …

A particularly interesting portion from this post:

• Spaces…

https://syphon.org/…

For anyone who’s an admin, seems like a useful resource…

Simply go to Options > Options > Advanced > Config Editor.... Then click I accept the risk! and set chat.prpls.prpl-matrix.disable to false. Then, configure a Matrix account as a ‘chat’ account, in the place where you’d add accounts usually. …