Why can't I buy BTC on MetaMask?

Could you possibly elaborate on the reason why I am unable to purchase BTC through MetaMask? I've been attempting to do so, but seem to be encountering some difficulties. Is it a technical glitch, or is there some sort of policy or restriction preventing me from completing this transaction? Additionally, are there any workarounds or alternative methods I could use to purchase BTC, given that MetaMask doesn't seem to be working for me at this moment? I'd greatly appreciate any guidance or insights you could provide on this matter.