We are playing in Civ7. Peace offers don’t get through (as there was never send a peace offer).
Thank you for your work.
Could be a civ 7 only bug.
https://www.reddit.com/r/civ/comments/1rgo058/bug_in_civ_7_multiplayer_that_stops_you_from/
Yeah, unfortunately stuff like this we likely can’t do anything about. 
Hopefully it gets fixed in civ.