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Are your APN settings configured correctly?
Are all other collected apps and web browsing working ok?
What happens when you try to use YouTube?
Any error messages?
Could it be that the YouTube app doesn't have rights to use network connectivity?
Does it work on WiFi as opposed to mobile data?
Does YouTube in the web browser work?
Can you try your SIM in another unlocked phone to see if YouTube works there on 48 (with the APN settings configured correctly)?
If you need to contact 48 support about this then see the links in my signature below.