@braveDog6581 oh this is a great question!
I dont have ADHD myself, but I work with students, many of whom are neuro-divergent and have IEPs. So, some of the ideas I would have, as far as work accommodations, might look like: shortened work hours, more frequent breaks, asking to NOT multi-task, but complete one thing at a time, creating a certain time of day in which you are not interrupted, using notifications/timers/reminders, or having a script to utilize in certain situations.
If you (or others) are looking for more ideas about how to best use accommodations in the workplace, this site seems quite informative - https://adhdatwork.add.org/adhd-accommodation-guide/
Also, I have not ever heard of a workplace accommodation being denied - but I guess that is something you would need to take up with an HR manager.