No Device settings in Teams on my Samsung A7 Tablet

Hi

I have teams installed on my Samsung Tablet, I have a Jabra USB headset.  When using teams i connect the headset and the headset Icon appears at the bottom of the screen, I can turn volume up and down with the headset but can not use the microphone or earphones.  The microphone and speakers on the tablet work.  I have been in settings to choose device but there is no option to choose a device.

Help please