Error downloading CMIP6 projection from CDS using cdsapi

[gar305]

I am using cdspi 0.7.6. version

When I submit a request, I encounter following error

However, same request works fine when I run it on the CDS website. Below are the parameters in my request

    dataset = "projections-cmip6"
    request = {
        "temporal_resolution": "monthly",
        "experiment": "ssp1-2_6",
        "variable": "surface_temperature",
        "model": "access_cm2",
        "year": [
            "2015", "2016", "2017",
            "2018", "2019", "2020",
            "2021", "2022", "2023",
            "2024", "2025", "2026",
            "2027", "2028", "2029",
            "2030", "2031", "2032",
            "2033", "2034", "2035",
            "2036", "2037", "2038",
            "2039", "2040", "2041",
            "2042", "2043", "2044",
            "2045", "2046", "2047",
            "2048", "2049", "2050",
            "2051", "2052", "2053",
            "2054", "2055", "2056",
            "2057", "2058", "2059",
            "2060", "2061", "2062",
            "2063", "2064", "2065",
            "2066", "2067", "2068",
            "2069", "2070", "2071",
            "2072", "2073", "2074",
            "2075", "2076", "2077",
            "2078", "2079", "2080",
            "2081", "2082", "2083",
            "2084", "2085", "2086",
            "2087", "2088", "2089",
            "2090", "2091", "2092",
            "2093", "2094", "2095",
            "2096", "2097", "2098",
            "2099"
        ],
        "month": [
            "01", "02", "03",
            "04", "05", "06",
            "07", "08", "09",
            "10", "11", "12"
        ]
    }

[maurofaccin]

I think it's ssp1_2_6 (see underscore)