More SASL failures

[for-coursera]

There's already an issue concerning SASL failure at rizon.net, and on irc.abandoned-irc.net I get this:

karkar.abandoned-irc.net ACK sasl                                                                                                                                  
karkar.abandoned-irc.net EXTERNAL,PLAIN are available SASL mechanisms                                                                                              
karkar.abandoned-irc.net SASL authentication failed

And on irc.financialchat.com just this:

montreal.qc.ca.financialch NAK sasl

My nick there is registered on both servers, and I use this to produce a token:

python -c 'import base64; print(base64.encodebytes(b"nick\x00MyNick\x00MyPass"))'

And just in case, the same kirc with the same routine works just fine for irc.libera.chat.

Any hints? :)