volume not working on MacBook Pro after using headphones

Kath535 wrote:

Thank you for that. My MacBook Pro is a 2015 with MacOs Catalina version 10.15.7

I know in the past there was a mechanical issue with the switch inside the headphone jack— look in there for a red light(?)

You can try inserting / re-inserting the headphone jack with some intention in an effort to get the switch to release.

Otherwise make some changes in the Preferences pane:

>System Preferences>Sound and see if something gives there.

If the internal speakers on your Mac aren't working - Apple ...

Kath535 wrote:

I cannot get volume to work on MacBook Pro after using headphone jack. When plug headphones back in, volume works fine again.

You can help yourself by stating what exact Mac is this....(?)

There are over 52 models of MBP released since January 2006—as you can imagine they are not all the same.

About System Information on your Mac - Apple Support