One account can comprise of more than one entity: main profile plus persona(s). There is only one direct connection between two accounts at the same time regardless of the entity they use to connect with each other.

For a group chat of two or more accounts which is not initiated as a sub-channel of a group, there must be direct connection of at least one member with the others for the chat to be active. Otherwise, the chat will be inactive.

Group chat mechanism

Group chat mechanism