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FIREFOX Solution.!
Currently there are more users who join us, and so also the errors or doubts with the app, a few days ago I presented the error where the app did not load after Placing (User and key master), the application simply remains as if nothing , try in different browsers, chrome, brave.
But none of them worked, the only option left was firefox, try and it worked, you just have to download firefox and immediately after installing, go to download the app from the official page:
https://hive-keychain.com/
and place everything correctly and wow, you already have the app working correctly. (Support could not find a solution to this problem, I hope it helps you).