Just tested the YouTube app on Apps with a Chromecast using MicroG v0.2.8.17785 and it was working. I am testing on a Pi/e/ build not sure that should make a difference
Looks something is different in my phone from yours 
But I’ll give it another try by night and see if I am the one missing something here.
Thanks in advance.
Check the wifi network of your chromecast and your phone they should be the same. I have two networks on my wifi router which causes some confusion.
I only have one wi-fi network at home so this shouldn’t be the problem but I’ll run a test by night with my /e/ phone and my Lineage phone. Both with official YouTube apps.
I’ll post the results here by tomorrow, ok?
Thanks again for your attention @Manoj.
Hi @Manoj
Unfortunately, it did not work.
Only one network, both Chromecast and phone connected to it, and no cast icon.
No firewall or antivirus on phone.
I tried other apps that has support to Chromecast like Netflix, XPlayer…
I have a Google account on the phone.
I even tried the Google Home app (from the App Store).
Well, I guess I’m out of luck here. 
If you think of something else let me know, ok?
Thanks for your attention.
Strange. Can you try to reboot your phone and again check if the cast icons appears. If it is still not showing up you should log a bug report with logs or let me know and I shall reopen the bug that I had closed. You can add you log and phone make ,OS details to it.
Hi @Manoj
My tests failed again.
I added a comment on your bug report at Gitlab and attached a logcat.
Thank you.
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Just wanted to come back here to ask: has anyone been able to use /e/ to play sound on a ‘Chromecast built-in’ speaker? that’s one of these speakers with the Google casting technology inside. Not talking about a TV or a set-top box with Chromecast here. Wanted to hear from users before trying it out this weekend.
Edit:
Just tried: I was successful playing music through Chromecast with the DS Audio app on /e/! Good news! However, with the Spotify app, although it lists my speaker, it says ‘Connecting’, and never connects.
Edit 2:
If Chromecast wasn’t working at all for me I would suspect a problem of MicroG not supporting Chromecast and just give up. But I made it work with DS Audio! How is that possible?
Edit 3:
In this configuration the control functions with DS Audio are very limited. Play, pause, previous, next. I think that’s it. I can’t change the volume, so it’s pretty useless.
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My assumption after discussing it on Reddit:
https://www.reddit.com/r/Chromecast/comments/eabp8b/local_music_library_stored_on_synology_nas/fat9ar6?utm_source=share&utm_medium=web2x
I’m interested in any solution that uses one of those Linux distributions for audio on Raspberry Pi. For music stored locally, these methods can create a local network and stream the music. And any web browser can be used as a remote control when typing in the local server URL. Control with an Upnp/DLNA app is also a possibility if the server can stream DLNA.
@cedricoola If you want audio sync in different rooms then look at PiCorePlayer. If you don’t need that then look at it anyway but also look at Volumio.
Yes, there are a few solutions available for Raspberry Pi. There’s a list here that includes PiCorePlayer. https://www.justboom.co/software/
I’m thinking about trying one that runs as a WiFi dongle on the thiny Raspberry Pi Zero. My server would be on another device like a pc, a NAS or Raspberry. From what I see, only the Justboom Player and the Max2Plax solutions seems to handle the Pi Zero. If anyone has experience with something smilar, I’m curious.
The main reason I haven’t tried yet is that the Pi Zero is out of order in my local stores.
I give up the DIY solutions and will try this instead: https://www.kickstarter.com/projects/octavio-tech/octavio-your-music-anywhere-at-home
It’s a small and un-googled spotify streamer. Looking forward!
They just finished the crowdfunding campaign and mention a delivery date in November this year.
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It’s already available here since months 
https://www.balena.io/blog/turn-your-old-speakers-or-hi-fi-into-bluetooth-receivers-using-only-a-raspberry-pi/
I need to try it since a long time, maybe i will configure it this week-end and I will post a feedback 