It's working now, After several attempt, I gave up, Next day I try again, it start working, I guess, restarting the computer could be the solution at least for me. Thanks.
Same problem.
Using MacOs Mojave 10.14.5
Enpass 6.1.0(390)
In FireFox 67.0.2 (64bits)
also Chrome Versión 74.0.3729.169 (Build oficial) (64 bits).
It was working with FireFox, but I don't know when it stopped working.