Being a developer just has more grunt work than I initially expected. Whether it's meetings, ops, security, mentorship, support, or whatever else- developers have to do those things. You can still frame this as development work, and you should approach it as a developer (How can I automate the task away, or make/suggest an improvement in our code, UI, or docs so that I don't have to deal with this again)
If that doesn't help you, and you don't want to leave the team on short notice, I would suggest approaching the subject with your manager again and coming up with a clear plan to get out of that work, with a timeline attached to it. There is a reason your leadership attaches timelines to work- it makes things happen. Take advantage of that, and give your leadership a timeline