Yesterday, I've reviewed on Facebook the devices I'm logged in, and did a cleanup.
Then, I logged in into my remaining current devices: Mac (Brave browser) and Android (Facebook app). As expected, I had to use password and Authenticator, all fine.
What's weird now: Anytime I log into the Mac, I get logged out from the Android, and vice versa.
So I assume there must be some setting "allow/disallow being logged into multiple devices". But I can't find it. Where I looked:
On Password and security, I see "Saved login". I states that my login info is saved on this device.
Yet on Where you're logged in, I always only see the current device (and I'm getting logged out from the other).
Any idea what I could try else?