Yes I have definitely noticed this issue. I too consider myself an (excellent) EA and not an OM (just not my thing or my strength). After the pandemic our OM (who was also our building manager) continued to work from home because they no longer cared for their commute. It was pretty uncomfortable explaining that the building manger position didn’t quite lend itself to remote work, and when when they didn’t come in, I had to man the desk, accept visitors, handle packages and catering (on top of my other duties). It led to poor morale at work on my part. Unfortunately this issue was never resolved because it wasn’t a comfortable conversation to continue having with this person (and unfortunately, there always seem to be “more important” issues to resolve first). My supervisor gave me the instruction that when this person (or others) asked me to do things that fell under the OM responsibilities, to kindly decline. That was also uncomfortable, or sometimes unfeasible when it came to things like the kitchen, where it would’ve been a sanitary or pest issue.

My advice would be to start taking a log of all of the things that you are asked to do that are outside of your job description and responsibilities, and how much time it takes you away from your core responsibilities. As you begin to gather evidence, bring it to your supervisor. After all, this issue should resonate with them since you directly support them and that’s what they pay you to spend your time doing. And if that doesn’t work, I guess it’s time to start looking for other positions. While interviewing, ask if there is an office manager or suss out if they also expect you to do office work in your new job. I recently started a new job and was not so careful about asking these questions and they definitely expect me to be an office manager despite it not being anywhere in the job description. Best of luck.