ETRS89 + DHHN2016 height - EPSG:9924

WKT

HVCOORDSYS["ETRS89_and_DHHN2016_height", 
	GEOGCS["GCS_ETRS_1989", 
		DATUM["D_ETRS_1989", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	VERTCS["DHHN2016_(height)", 
		VDATUM["Deutsches_Haupthoehennetz_2016"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", 1.0], 
		UNIT["Meter", 1.0]]]

WKT2

COMPOUNDCRS["ETRS89_and_DHHN2016_height", 
	GEOGCRS["GCS_ETRS_1989", 
		DATUM["D_ETRS_1989", 
			ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	VERTCRS["DHHN2016_(height)", 
		VDATUM["Deutsches_Haupthoehennetz_2016"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", up, 
			LENGTHUNIT["Meter", 1.0]]], 
	ID["EPSG", "9924"]]

Data from @esri/proj-codes

{
  "wkid": 9924,
  "latestWkid": 9924,
  "pcsWkid": 0,
  "gcsWkid": 4258,
  "vcsWkid": 7837,
  "macro": "PE_HVC_ETRS89_DHHN2016_HEIGHT",
  "name": "ETRS89_and_DHHN2016_height",
  "wkt": "HVCOORDSYS[\"ETRS89_and_DHHN2016_height\",GEOGCS[\"GCS_ETRS_1989\",DATUM[\"D_ETRS_1989\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],VERTCS[\"DHHN2016_(height)\",VDATUM[\"Deutsches_Haupthoehennetz_2016\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]]",
  "wkt2": "COMPOUNDCRS[\"ETRS89_and_DHHN2016_height\",GEOGCRS[\"GCS_ETRS_1989\",DATUM[\"D_ETRS_1989\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],VERTCRS[\"DHHN2016_(height)\",VDATUM[\"Deutsches_Haupthoehennetz_2016\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]]],ID[\"EPSG\",\"9924\"]]",
  "description": "ETRS89 + DHHN2016 height",
  "authority": "EPSG",
  "version": "10.042(13.4.0)",
  "deprecated": "no",
  "areaname": "Germany - onshore",
  "extent": {
    "slat": 47.27,
    "nlat": 55.09,
    "llon": 5.86,
    "rlon": 15.04
  }
}