256 devices is the maximum supported on an individual Premium network. You can add another Premium network or upgrade to a Multi-Network subscription that supports "an unlimited number of networks with up to 256 members per network. With Multi-Network you are still subject to the limit of 256 clients per account. The number of clients allowed at the account level is independent of the number of members per network. This means that you can have potentially far more members in your networks than clients attached to your account."
Glenn is a member of the GoTo Community Care Team.
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