Xml Browser using Google Firebase

[Sztaho]

Dear All,
I am having difficulties with Google Firebase and XML browser function (on Yealink T19 E2). I am trying to download an XML application using XML browser from a Google Firebase function, however it always says "Load error". And in the log file, there is a download error (-3 error code). Using the same XML structure on a custom web server, it works.

Firebase link: https://us-central1-voipxml.cloudfunctio...iveVoipXml

The response from the server:
xml=<?xml version="1.0" encoding="UTF-8"?>
<YealinkIPPhoneTextMenu destroyOnExit="yes" Beep="yes" doneAction="Dial:062011122233" Timeout="10" LockIn="no">
<Title wrap="yes">Hívás</Title>
<MenuItem>
<Prompt>CRM hívás</Prompt>
<Dial>062011122233</Dial>
</MenuItem>
<SoftKey index="1">
<Label>Vissza</Label>
<URI>SoftKey:Exit</URI>
</SoftKey>
<SoftKey index="2">
<Label>Hívás</Label>
<URI>SoftKey:Send</URI>
</SoftKey>
</YealinkIPPhoneTextMenu>

The HTTP response is correct. Using a custom web server (IIS), with the same response, it works.

Anyone having trouble with Google Firebase?

thanks,
David