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This looks like an error in the service, not in the ability of QGIS to access the service.

https://wcs.hycom.org/thredds/wcs/GLBy0.08/latest?service=WCS&version=1.0.0&request=DescribeCoverage&CoverageId=water_u_bottom&

A describe coverage request on the water_u_bottom coverage shows an invalid CRS (EPSG:0 [Latitude_Longitude]):

<gml:RectifiedGrid srsName="EPSG:0 [Latitude_Longitude]" dimension="3">
    <gml:limits>
        <gml:GridEnvelope>
            <gml:low>0 0 0</gml:low>
            <gml:high>4499 4250 39</gml:high>
        </gml:GridEnvelope>
    </gml:limits>
    <gml:axisName>x</gml:axisName>
    <gml:axisName>y</gml:axisName>
    <gml:axisName>z</gml:axisName>
    <gml:origin>
        <gml:pos>0.0 -80.0 0.0</gml:pos>
    </gml:origin>
    <gml:offsetVector>0.08000000976779562 0.0 0.0</gml:offsetVector>
    <gml:offsetVector>0.0 0.04 0.0</gml:offsetVector>
    <gml:offsetVector>0.0 0.0 128.2051282051282</gml:offsetVector>
</gml:RectifiedGrid>

Note that the reference to urn:ogc:def:crs:OGC:1.3:CRS84 here is a reference to the description of the envelope, not to the CRS.

When you try to load a coverage, QGIS uses a default CRS (OGC:CRS84) to give a GetCoverage request like:

https://wcs.hycom.org/thredds/wcs/GLBy0.08/latest?SERVICE=WCS&VERSION=1.0.0&REQUEST=GetCoverage&FORMAT=GeoTIFF_Float&COVERAGE=water_u_bottom&TIME=2020-08-18T12:00:00Z&BBOX=0,-80,359.9200439453125,90&CRS=OGC:CRS84&RESPONSE_CRS=OGC:CRS84&WIDTH=10&HEIGHT=10

But the server replies with an HTTP 400.

You can access the service in QGIS if you use a full GetCoverage request without any CRS, as a raster layer specifying an HTTP/S connection instead of a file, like:

https://wcs.hycom.org/thredds/wcs/GLBy0.08/latest?SERVICE=WCS&VERSION=1.0.0&REQUEST=GetCoverage&FORMAT=GeoTIFF_Float&COVERAGE=water_u_bottom&TIME=2020-08-18T12:00:00Z&BBOX=0,-80,359.9200439453125,90&