Sounds like the mic was disabled or its driver got lost when the app crashed. Try these in order:
1. Settings → System → Sound → Input: if the mic is missing, open "All sound devices" and check whether it's listed as Disabled — click it and choose Allow.
2. Settings → Privacy & security → Microphone: make sure "Microphone access" and "Let apps access your microphone" are on.
3. Device Manager → Audio inputs and outputs (and Sound, video and game controllers): if the mic has a warning sign or is missing, right-click → Uninstall device, then Action → Scan for hardware changes.
4. Some laptops have a mic mute key (F4 or a key with a crossed mic) or a BIOS/privacy switch — press it once.
5. Still nothing? Install the audio driver from your laptop maker's support page (Realtek / Intel SST), restart, then test it at
https://mictests.com/.