Youtube casting not working, untrusted device

Youtube casting is not working from phone,

I get an untrusted device error,

Does anyone know how to fix this?

I have deleted and updated the chromecast build in app but nothing changes,

In fact I noticed when I deleted the app, casting still worked from my laptop, indicating it did not change anything about the casting part.

It only does not work from the youtube app in my phone

Hello,
Unfortunately you can’t install the Chromecast Built-in app to a projector that is not fully Google Certified, with GMS and GAPP.

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So this means that casting from Youtube from mobile phones not working is a known issue?

Or should I try update the firmware manually to see whether reinstalling the firmware fixes it?

Hello, the only way to use Youtube is with Screen Mirroring fonction.
You can use the AIRPLAY system from the PicoPix Max.