Whether in person or virtual, verbal group brainstorming tends to benefits those who are more extroverted and quick thinkers, and can be a struggle for introverts and processors. The comments about sharing background info and questions in advance are key. And tools like Jamboard and mural are key. In my work I teach people to run largely silent brainstorms. Whether people are broken into pairs (each pair with their own Jamboard page) or if the group is small enough to all work together, provide time for everyone to put ideas up. Then, in the spirit of “yes, and” ideation, do a second round where people must add ideas as a build onto what was already shared. No one is able to shoot down an idea. Ideas with traction will show lots of builds. Ideas without traction will simply be left alone. If decision-making is required in the process you can try heat mapping, asking everyone to place a dot next to what they deem is the top suggestion. Tools like these can also be used anonymously adding increased comfort if power dynamics are at play in the group. No need to worry about voting against your bosses idea if no one can tell whose dot is whose...