Unless they are down for some reason, the only Disney transportation option from Poly (or any monorail resort) to Epcot is the monorail.
From Poly, you can either:
1) Walk from Poly to TTC, get on the Epcot line at the TTC. You'll go through security at the TTC and then again when entering Epcot.
2) Take the resort monorail from Poly to the TTC, then transfer to the Epcot line at the TTC. You'll go through security at the Poly monorail station and then again when entering Epcot.
The walk is pretty easy and my preferred option, though it may not be suitable for those with concerns walking moderate distances.
Same options for getting back to Poly, just in reverse.
Yeah, that's a common misconception with Poly and the other monorail resorts. If the monorail is operating, under normal circumstances there will not be a bus to Epcot.
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