You didn’t mention that one of your remotes was working again - that’s an important piece of information.
In that case have you tried changing the batteries of the remote that isn’t working properly ? Obvious possibilities should be checked before more complex ones.
A second point I would make is that are you sure that your Samsung Smart remote was working via IR in the first place and not via CEC ?
I also have a Samsung Smart TV supplied with both the rectangular “standard” remote and the small curved “Smart remote” with the touch pad in the middle and a voice control button.
As far as I know, while the standard remote is a normal IR remote the smart remote is not an IR remote but an RF remote, (possibly bluetooth or similar) as it works without line of sight - you can put it inside a sock or a closed bag in an adjacent room and it will still work - in fact mine has sometimes started operating the TV from the bottom of a closed toy box exactly because of this, and I’ve then had to go searching for it to stop it taking over my TV…
It’s possible that it is both IR and RF but its much more likely that it is only RF, in which case it could never have worked with the IR receiver on the Vero4k in the first place.
Assuming the remote belongs to the TV connected to the Vero then its much more likely that it was controlling the Vero via CEC which is a remote control protocol over HDMI which is enabled by default in OSMC. Most TV remotes will work out of the box with OSMC via CEC.
It may be that you are having problems with CEC rather than IR.
Another thing I would say is that if you have learnt your Samsung remote buttons in a remote profile in OSMC (or downloaded a lircd profile for it) for use via the IR receiver in the vero and the TV is also in the room and connected to the vero then this is probably asking for trouble - because the IR receiver in the vero would respond to the button press directly and the TV would respond to the button press and attempt to send that to the Vero using CEC. (And even if CEC was disabled the TV would try to act on the button press itself causing unintended actions)
Normally it’s not a good idea to learn the remote codes for any remote that is already controlling a device in the room.
Edit: this is the smart remote I have that is RF not IR: