Congrats! It seems you are right it's taking some where between four month from DM.
Can you pls tell me how did you receive the invite, was it by mail or e-mail? Is your online status concurrent with the time u received it?
I got the email at first and few days later it showed up in the online portal. I did NOT receive it by regular post mail.
In the email instructions, it tells you that this is the only thing that you will receive and you should print it on paper and bring it to the oath ceremony as a proof. The email has 1 attachment which is a PDF file (3 pages in total). First two pages has instructions on the ceremony and what documents to bring and time and location...etc. Last page is the media release form that needs to be signed.
I did not get a prohibition form but I know that they will supply it during the registration when I go to the ceremony.
When I check the online portal, I do see it as step 5 where it says We sent you an invite....date and time.
The Sender email address of the oath invite was:
IRCC.DNCitSCRScheduling-ConvocationSCRCitRN.IRCC@cic.gc.ca
You can add this address to the Safe Senders list or whitelist in your email client if you are afraid of receiving it as spam/junk; which is very doubtful since the sender domain is
@cic.gc.ca which is a registered government site.
Best of luck to all.