Agreed with the undue burden/alteration of essential function piece, which can and will be used to deny employees certain accommodations, especially at more rigid sites (maybe due to things like budget/timelines that an internship program can't control or sometimes due to management philosophy).
Since it's still early in the game, could you ‘test the waters’ as you narrow down sites to apply to? Such as emailing training directors now about whether their sites anticipate providing telehealth care during your training year and if all interns might have partial telework capability?
You might get an informal sense of what care looks like at the site and flexibility versus rigidity of the program. And if you have a dream site that appears on the no telework ever/rigid side of things, then you can make a more informed decision about if/when to ask about specific accommodations, consider whether your accommodations might fall under undue burden/alteration of essential function, and perhaps not apply due to poor non-clinical fit.
If you're a strong candidate without geographic restriction or in need of a very niche internship, I imagine you'd still be able to put together a nice list of sites, even if you self select out of some otherwise appealing locations. Good luck!