Hello, I'm Drift. I'll do my best to help you with it. So, according to your describing, you are facing problems with you unable to accept callouts.
First Solution:
Navigate to this root directory for LSPDFR: Grand Theft Auto V>lspdfr (Search for a ini file that says "keys".
Open the keys.ini file with any editor (Notepad, Visual Studio Code, Notepad++) and look for "ACCEPT_CALLOUT_Key="
Now the default key will be the "Y" Key, but in case you may have changed it. It will work according to the key you may have selected.
Note: "ACCEPT_CALLOUT_ModifierKey" If you added a key here, be sure it basically means you'll have to press to key individually at the same time for the "ACCEPT_CALLOUT_Key=" to work.
Let me know if this works, If not we'll further investigate this issue. 🙂
Also if possible, please provide your RPH (Rage Plugin Hook) Logs in here by attaching it in the reply.
Navigate to this root directory for RPH Logs: Grand Theft Auto V>Logs.