Hi Torbjorn,
The documentation says you need to use the broker account main password:
1.3.4Can I log in to the broker account using the read-only “investor” password?
The Sender account can be logged in to MT4/5 using the read-only “investor” password, because the Sender EA does not place trades.
The Receiver account cannot be logged in using the read-only “investor” password. The Receiver EA obviously needs to place trades, and so MT4/5 must be logged in using the master account password.
The heatbeat means the receiver is properly connected to the sender. However, the receiver still may not be able to place trades without the master pw.
Alan,