Can't connect to any broker using wss

[RobertoD91]

Testing connection from both https://mqtttiles.flespi.io/ and self hosted version versus this brokers:

• emqx websocket + TLS
• hivemq.cloud websocket + TLS

nothing work

using https://websocketclient.hivemq.cloud/ i'm able to connect to hivemq broker

in the browser console i get this errror:

vendor.c1baebb7.js:76 WebSocket connection to 'wss://***.hivemq.cloud:****/' failed: 
d @ vendor.c1baebb7.js:76
g @ vendor.c1baebb7.js:76
l @ vendor.c1baebb7.js:70
k._setupStream @ vendor.c1baebb7.js:70
k._reconnect @ vendor.c1baebb7.js:70
(anonimo) @ vendor.c1baebb7.js:70
vendor.c1baebb7.js:76 WebSocket connection to 'wss://***.hivemq.cloud:****/' failed: 
d @ vendor.c1baebb7.js:76

[bam80]

@dexif could you comment?

[dexif]

Just successfully connected with credentials from this official HiveMQ demo https://www.hivemq.com/demos/websocket-client/

This example (from issue starter) did not work for me https://websocketclient.hivemq.cloud/

We tested MQTT Tiles with our MQTT broker https://flespi.com/mqtt-broker and Mosquitto, and it works fine.