We stayed a night at Shades of Green on Saturday. Their ticket office in the resort is open now. Hours are 8 a.m. to 7 p.m. if I recall correctly.
They have also been responding to emails throughout the pandemic. We bought tickets right before they shut down when WDW halted ticket sales.
When WDW reopened sales, they were slower to respond but in recent weeks they've been faster in responding (we had to adjust the # of days on our original tickets). I did have to follow up after they said to send them additional information from my receipt b/c they never responded. A week later, I sent a second email and they answered very quickly and I got my extra days added.
Good luck and happy planning!