Outerplane & Citymapper: I don’t know what these are so I can’t say
Firefox: works
LinkedIn: Should work. I don’t see why it wouldn’t work but I haven’t tried
Discord: Works, without notifications though
Slack: Should work. I don’t see why it wouldn’t work but I haven’t tried. Just note that you probably won’t get notifications
WhatsApp: I haven’t tried myself but from what I see here in the forum, it should work…? (without notifications though)
Workday & Chase: I don’t know what these are so I can’t say
Lloyds bank: For banking apps, it’s always hit or miss. You can look here: Banking apps on Sailfish OS
Contactless payment won’t work as far as I know because I think Android AppSupport can’t access NFC. But I might be wrong