Jabra Evolve2 85 Low audio on calls only

Using other wireless and wired headphones I have higher call audio volume in RC (web based). Set the Jabra Evolve2 85 as the output/input device for RC and set audio at 100% with no difference to call volume. System sounds and internet audio are all normal volume. The ring of an incoming call is normal, but the actual call volume is still very low.  So just the RC is an issue. Any ideas to fix? TY