I’ll be honest I’ve never been asked this before. AFAIK it won’t set the alarm off nor will it stun the panel temporarily but I’ve never tried to almost brute force a panel before
Fobs don’t normally disconnect themselves from the panels but inadvertently someone might have pushed the fob buttons in a sequence to put them into relearn mode.
Your user code may be setup as a manager rather than a user on the panel. Push D, enter your code, navigate through the menu to see if you can find edit users and see whether the fobs are there already or can be added.
I doubt it. Honestly can count on one hand the number of problems I’ve had on the comms side of things. Usually the root cause it the 5g override on routers.
And if you go from Home Screen and enter code and then push no when you get the error you just go full circle?
If so then I’d suggest the power cycle as suggested.