Node-Red Thingsboard mqtt problem

Hello i'm not able to send values to Thingsboard from node red using mqtt.
Broker = demo.thingsboard.io
port = 1883
topic = v1/devices/me/telemetry
copied the correct access token multiple times.
have tried sending this
{
"value" : 25
}
in template node, inject node, and also tried json node. no luck.

Have seen this issue here before, but not a good solution that actuall worked for me.

Thanks

best regards

ok so if i use cloud.thingsboard.io instead of demo.thingsboard.io it works.
Any idea?

without showing us any errors from the logs then only guess is that the token for one is not the same as the required token for the other.

just tried again, but no. i will just stick with cloud.thingsboard.io