Thank you for the very detailed answer.
I am trying to reproduce the problem but I am yet unable to do so. In my tests, I can add a market successfully, when the plugin is network activated.
If it’s not too much to ask, could you please also tell me the following?
1. Does the new market appear in the *admin screen* after you click on “save changes”? i.e. is it listed under Wallets -> Exchange -> Markets?
2. What is the output when you navigate to https://example.com/?__wallets_exchange_action=get_market_summaries (replace example.com with your site’s domain).
3. In your browser’s JavaScript console, what is the output of the following?
JSON.stringify( wp.wallets.viewModels.walletsExchange.marketSummaries() );
Thank you for your help.