When run etautil error messages appear:
"Class 'ETDYNAccount' is not a valid class name"
"ETAUTIL return code = 136"
IM 14.5 (but probably the problem and the resolution are the same for other versions)
etautil command should be run with -DYN option.
Add -DYN option when run etautiul. E.g.:
etautil -d IM -u etaadmin -p <password> -DYN -f .\test.txt