I am getting blue tint in my photos with flash on Iphone X. Why is this happening??

See if you have a filter turned on. When you go to the camera, there is a button in the upper right corner that looks like 3 grey circles overlapping. If you tap on that, a row of filters appears just below the photo. It should show original, and then you can swipe through others. If it is showing a blue tint, it could be a cool filter. They have a bluish tint to them.

See this to locate who to contact for Apple Service, Contact Apple for support and service - Apple Support

Can you upload a sample photo. Make sure there is no personal or identifying information in it. When you type in the text box here, you can see a status bar below of icons. To add a photo, click on the next to last icon that looks like a photo of mountains. Make sure that you check the filters, because if you turn it on, it stays on until to change it. Just tapping on the circles for filters does not turn it off, it just removes seeing them on the screen. If you tap on the filters button, make sure that original is the one showing.

What is that a picture of? I don't see any image. Note that the "flash" has a range of about 6 feet. If you use it for something further away than that it won't provide any benefit, and can skew colors in whatever the scene is.

That appears that it is washing the entire photo blue, unless you are taking a photo of something I don't see here. Does this only happen when you have the flash on?

Do you have a case on the phone that might be reflecting the flash back into the camera? Try removing any case you have on the phone and see if that changes things.

I would suggest making a Genius Bar appointment at the nearest Apple Store to have the device examined by Apple. They can explain your options from there. Bring them a photo that you have taken.