Installing key fobs

@davey_d​ Does't work....Been trying to install 3 new Foyfobs with no success at all....The base is not beeping when I install the #,,,and hit the Panic button.....???????  I have tried 8 times...In every why possible...These are New Replacements...ALL Batteries check out 3 V....Next question,,,,Red panic button before I enter the # doesn't work,,,,Red Panic button after....I have used the APP, on Cell Phone, I have used the Online site with My Laptop.....Talked to a tech..he supposed to walked Me through a Complete RE-Set....after..Only 1 key Fob worked..The USB one.....but in just a few minutes it even stopped working...so today I have 7 Key Fobs and Not one will work......Yes My system in old....6 years ..but it works fine otherwise.....sometimes the Key Pad #s I have to push really hard...not buying a New System.  I have paid Simplisafe 25.00 a month for 6b years... Thats about $1800.00.....plus the 400.00 to buy it ...If I can't get it working right soon...I will switch to ADT ...at least they give all new equipment...and Install it...

@thomaseg49​ Have you tried removing the batteries from your Keychain Remotes and inserting them back in? This can help to ensure that they're properly seated. Once you reinsert the battery, I would then try to add the Keychain Remote to your system.