Google Nest Community

I think I have the correct thermostat selected. My C wire is connected and has power (confirmed by my ac guy), but I'm still getting the error saying it's not connected. Any suggestions how to fix this?

Hello,I installed my nest thermostat. Everything seems to be working, but the C wire isn't being detected. When connecting through the home app it did flash that it wasn't detected, but i reset the wire and it went away.How can I fix this, if I reall...