In Tutorial 2.2 and 2.3 we claim that
# LOSC bulk data typically uses the same convention for internal channels names
# Strain is typically IFO:LOSC-STRAIN, where IFO can be H1/L1/V1.
channel_name = "H1:TEST-STRAIN"
The channel name here is outdated, the new channel name convention is: {IFO}:GWOSC-{s}KHZ_R{n}_STRAIN.