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Hi there, Are you using unique identities for each participant that’s connecting? In other words, when you generate a token for each participant, are you setting their identity field to something unique? If this isn’t the issue, we’ll need some more information or a code snippet and/or log output to understand what’s going on. It’s difficult to help you debug from the description you shared.

congestion control disable solved the issue

Hm, on the surface that seems like an unintentional fix? cc @dry-elephant-14928

As using iceTransportPolicy:true without no pass username solved it