Not getting log-in approval notifications on signed in devices

Hello - will appreciate any help with this one! I am having an absolute nightmare getting into my Facebook account on desktop, which I need for work

I am logged in on two phone devices and my wife's laptop but the notification that allows me to approve from another device just won't come in at all so I can't get further - I don't have access to a 2FA authenticator (and haven't used that as a means to log-in for years)

I am unable to change my 2FA options from a logged in device as the only option is is giving me is to use the authenticator method or to use a backup code (which I don't have) - there no longer seems to be an option to receive a text to the linked phone or to receive an email

I have tried changing the password, clearing all cookies, incognito mode, but nothing is working for me, despite being logged in okay on other devices. Has anyone else had this? I am keen to avoid doing anything that will log me out of my other devices if possible as I have a fear that I won't get back in

Thank you so much for any advice