There's another community post with 404 debugging tips that might be helpful. Please give these solutions a try and let us know how it goes.

https://community.vercel.com/t/debugging-404-errors/437

Vercel Community

Debugging 404 Errors

Sometimes things don’t go as expected when deploying a website. If you see a 404 on your site, that means the page or resource couldn’t be found. There are...

A human should be around soon to offer more advice. But you can also get helpful information quickly by asking v0.

Did you check the link shared above?

Yes, I did, thanks - I’ve not been able to put into effect to see if it worked yet but I plan too soon so will see soon!

Update to this - found the fix! All that had to be done was to create a vercel.json file and put the following code below in it to work! So if anyone runs into a similar issue, this will probably help

vercel.json

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{
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  "rewrites": [
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    {
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      "source": "/(.*)",
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      "destination": "/index.html"
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    }
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  ]
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}

Thanks for sharing what worked for you!