Hi there, Gizmo!
Thanks for visiting the Apple Support Communities. If I understand your post, you're not able to use your microphone in apps that you use on your iPhone. I'm happy to help!
Apps are granted access to your microphones the first time you open them after installing. If you've given access to apps previously and they've stopped working, you can typically get the microphones working again by enabling them under your privacy settings: Change app access to private data on iPhone - Apple Support.
I'd also suggesting making sure that there are no restrictions set for the microphone access: Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support.
Finally, try uninstalling the apps: How to delete apps on your iPhone, iPad, and iPod touch - Apple Support, then reinstalling them: Redownload apps, music, movies, TV shows, and books - Apple Support. The first time you open the apps after reinstalling you should be prompted to grant access.
Have a lovely day!