Hi - can you confirm the name of the colour again?

Marylee,, its 7542 Naturel.

Does it turn grey-blue in the daylight or only at night, with the lighting switched on?

its always a grey blue. I just want a light taupe that reads warm on the walls.

Naturel sits just past the centre of the Yellow Hue Family. In balanced lighting it would likely be described as a greyed-beige or greige. But in your setting it reads more more blue.

We could look for a colour from further anti-clockwise on the Color Wheel heading more towards the Yellow-Red Hue Family.

Just one approach, as you find Naturel greys-out in your lighting, is it might be worth looking at a colour with a greater quantity of Chroma (colourfulness)

I can have a look tomorrow.

What light bulbs are you using? What side of the house is this facing?

SW Naturel is a gray/ green; these type of colors can read very different than expected in ones lighting. Did you pick this color while standing in your space?

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I am an artist, not a decorator, but I will tell you how I solved a similar problem. I got a stack of paint samples and taped them to one wall. Since your walls are already painted, you may have to put a large piece of white paper or foam board behind them. I rated the colors, morning, noon, and night. I wanted a color that would look good in the daytime and at night. Both natural and artificial light will affect how they look. The carpeting was tan so I checked the colors against the carpeting as well. I ended up choosing Sherwin Williams 'Downy" which is a white with a pink cast. I never would have found it if I had not tried out all those samples. Before I painted the entire room, I set up a large piece of foamboard painted in 'Downy' as a final test. Good luck.

Good thoughts. But save money by getting samples from samplize.com Get BM Chantilly Lace. Use it for a clear white comparison color. They have peel off backing. I clip backing off corners to get feel for color on various panes of vision. No pots of sample paints to safely dispose of. No added cost for brushes, foam boards etc.

Yes I painted multiple posterboards and put in numerous rooms/corners. All read a soft taupe. I even primed part of a wall and painted the wall and it came out taupe. Painted whole wall and it turned gray blue. If i put white around a painted square on the wall it looks taupe next to the white. Its driving me crazy. This is a south facing room.

In descending order these colours move further towards the Yellow-Red Hue Family. They each also have more Chroma and are lighter than Naturel.

In balanced light they are clearly more yellow than you say you are after, but if your light greys-out colours, then they should be less grey than Naturel.

If they still appear blue or even purple-ish then time for a re-think.

Am not suggesting this is the only route, but it will help eliminate some options. Also I would try larger paint chips before considering sample pots.

As @RL Relocation LLC suggests, first change the lighting.

I would agree but the OP states it occurs in all their available light, both daylight and lighting,,

But you have to start back at the beginning now, and I think step one is move to a more, white colored light bulb.

Did you cut this color? Is that the full strength?

Yes, this is full strength color.

Then you have a lot of light in this room! It looks much lighter o the wall than on the paint chip . As RL Relocation said, check your lighting!