"A good number of us in sales are seeing customers in person. Some customers are requiring us to be vaccinated to see them in person. How are the un-vaccinated going to address that with their customers?"
Since vaccinated individuals can still get and transmit Covid, and depending upon when they were vaccinated their own protection may have waned, a much better approach would be to have all individuals test prior to in person meetings. Nothing is perfect, however this would be a much more logical approach than simply assuming a vaccinated individual could not have or transmit Covid while believing that all unvaccinated automatically have Covid.