I was in a small, high-performing team about ten years ago that was analysed by the Human Remains team to find out what our secret sauce was.
The consultants who came in found a bunch of stuff that shut down the project pretty quickly, namely that we were all doing multiple 'jobs' outside our actual roles, and were all 'emulating' - ie doing stuff that didn't necessarily come easily to us. Emulation (much like HW or SW emulation if we're talking computery stuff) isn't easy and takes lots of resources. The consultants said we were all borderline nervous breakdown cases because we were doing stuff that didn't come naturally and therefore was exhausting. HR noped away from dealing with that. 😀
In the context of what you're doing, Molgrips, that's trying to do salesy or customer relationship-type things when you're good at concentrating, burrowing into technical detail and fixing stuff. It's inherently tiring, stressful and time-consuming for you because it doesn't come naturally. Again, don't get down because you're not necessarily automatically good at all the things. It's not how humans are, and it's totally fine to be good at something and not at something else.
The situation you describe suggests that a sales person was less than honest with a customer. They can't expect you to automatically be dishonest.
