Hey KF!
Last time I checked the terms of service on Bing were prohibitive for TF using them unfortunately. They wouldn't be WMS but under TMS which TF does support. TF just doesn't have a custom TMS server capability.... yet.
There isn't a quick way to determine compatability unfortunately. WMS is pretty good but has so many options and projections that it can be pretty arcane to really figure out what a server has. Best way is to go to the dev console on your browser (f12 usually) and see what a site is using for a full query. That's where I usually start.