Seems like I'm the same boat the others that are waiting for their certificate from the Ottawa office.
My Oath was the 15th of November, no signs of life since then. My ECAS is still saying "In Progress" for the ceremony step.
Tried e-mailing them at the "Ottawa CIT Scheduling / Planification CIT Ottawa (IRCC)" address, but no response besides the standard auto reply.
I'll try calling tomorrow to see if they have more visibility (has it been printed? has it been sent?) and can send the team a message. After that I'll hit up my MP.
What e-mail addresses have you tried?