I have the same error on Debian 11:
[...]
yowsup-cli v2.0.15
yowsup v2.5.7
[...]
INFO:yowsup.common.http.warequest:b'{"login":"XXXXXXXXXXX","param":"authkey","reason":"missing_param","status":"fail"}\n'
status: b'fail'
reason: b'missing_param'
param: b'authkey'
login: b'XXXXXXXXXXX'
