Mutual funds quote not working after moving to alphavantage

[Andrea Beddoni]

I have just switched to alphavantage on Gnucash 2.6.12 (Ubuntu 16.04)
The quotes for ETFs are retrieved (i.e. IGLS) even if with a value 1/100 of
the actual (i.e 1.32 instead of 132), however the quotes for mutual funds
(i.e. GB00B4PQW151) are not retrieved.

When trying to get the online quotes I get the message that Gnucash is
unable to retrieve quotes for all the funds

Any help on how to fix this would be greatly appreciated.

Thanks