XMPP/Jabber: fireshell[at]linux[dot]monster
OTR fingerprints: C47CFCDC D9F67D17 4C08AA1A C2500250 AB361153
Matrix/Element: [at]fireshell:matrix[dot]hostux[dot]net
IRC: fireshell on Libera Chat
OTR fingerprints: 1A66175C 7E713B1E 6D15079 87FB1952 C6866E05
Mull was fixed in the DivestOS repository as early as October 17th, but to do this you need to add to F-Droid and reinstall Mull.