Is it your mic? If so try the following. First, uncheck the checkboxes as shown in the attached screenshot. This ensures that Equalizer APO (being an Audio Processing Object) doesn't get bypassed when Discord tries to use your mic in exclusive mode. Second, that is for your mic and headphones, try all Audio subsystem settings found in Discord. Some have it 'automatic', others on 'legacy'. But you need to try them all.
Is it your mic? If so try the following. First, uncheck the checkboxes as shown in the attached screenshot. This ensures that Equalizer APO (being an Audio Processing Object) doesn't get bypassed when Discord tries to use your mic in exclusive mode. Second, that is for your mic and headphones, try all Audio subsystem settings found in Discord. Some have it 'automatic', others on 'legacy'. But you need to try them all.