Why is my boundingbox not working? (WCS)

I am trying to automate downloading with FME. When I use the WCS example link on this page it works: https://www.sentinel-hub.com/develop/api/ogc/ogc-examples/

When I create my own boundingox (ESPG3857) I get a bad request response.

http://services.sentinel-hub.com/ogc/wcs/{instance}?SERVICE=WCS&REQUEST=GetCoverage&COVERAGE=NDVI&BBOX=643176,6842280,751018,6988178&MAXCC=95&WIDTH=107842&HEIGHT=145898&FORMAT=image/tiff;depth=32f&TIME=2019-03-29/2019-05-29

If I replace my bounding box with the one in the example it all works. I can’t figure out why it is not working for my area of interest?

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I tried your WCS request with one of my instance IDs and I got the following response:
Output image area of 107842 x 145898 is too large! Should be at most 5000 x 5000 pixels.

I suggest you try again with a smaller bounding box and see if it works.
However, if you need data for such a large area you could either split it into several AOIs, or make use of our large area utilities in the sentinelhub-py package for Python.

Hope that helps.

Cheers