invalid identifier "2DZE5EU-...": check digit incorrect

[jmhostalet]

I cannot start server with the sample client file

# List your client-ids here
# Each line should contain only a single client-id followed by a comma (,) and a backslash (\)
# The last line shouldn't have the comma and backslash!
#
# Make sure no stray whitespace at the end of lines!!!
# with vim do :%s/\s\+$//e
#
# Please list the client ids here with name
#
# client-id                                                       description
# TVFU53T-M4J2ELM-ET9YZLI-SPHSWLY-WVO3T7B-RM3SC2A-EDURNZY-LUP5SQG client1
# 2DZE5EU-DGZIA5W-60ORFAS-S3PF74R-CWKTMTK-LHCBJES-W43SOFU-ZDCXMAI client2
CLIENTS=\
2DZE5EU-DGZIA5W-60ORFAS-S3PF74R-CWKTMTK-LHCBJES-W43SOFU-ZDCXMAI