Colormapped image required when converting .tif to .png with ImageMagick

As the title says when running the command:

convert -depth 32 ./heightmap.tif ./heightmap.png 

I recieve the error:

convert: colormapped image required `./heightmap.tif' @ error/quantum-import.c/ImportIndexQuantum/3034

From looking around I can only find this error in the code to print it out, has anyone come across is before? No one else has seemed to have any issue converting from .tif, and if they have it's because of delegate issues which I have already resolved.

This is on Windows Subsystem for Linux, running Ubuntu 20.04 LTS, and a fresh install of ImageMagick:

Version: ImageMagick 7.0.10-52 Q16 x86_64 2020-12-19 https://imagemagick.orgCopyright: © 1999-2020 ImageMagick Studio LLCLicense: https://imagemagick.org/script/license.phpFeatures: Cipher DPC HDRI OpenMP(4.5)Delegates (built-in): bzlib cairo djvu fftw fontconfig freetype heic jbig jng jp2 jpeg lcms lqr lzma openexr pangocairo png rsvg tiff webp x xml zlib