Hi
@Damien_GerardThere are several uservoices open regarding browsers. One which is under review is to relax browser checks which includes Vivaldi
https://microsoftteams.uservoice.com/forums/555103-public/suggestions/16941811-relax-browser-support...Another is here to allow all browsers
https://microsoftteams.uservoice.com/forums/555103-public/suggestions/37010722-expand-browser-suppor...There is no uservoice explicitly to allow Vivaldi so here is an opportunity to create one. I would recommend either voting on one of the above or creating one. In either case it would be worth trying to get it on the agenda with uservoice as others likely feel the same.
As with all uservoices these may take a long time or not get picked up. Microsoft are usually pretty strict browsers and where that would be on a priority list is uncertain. They have certain got more flexible but there is room to expand here.
Hope that answers your question!
Best, Chris
