I had ordered an ATIP after test when I found that eCAS didn't get updated to DM for over a month...
I find now on the ATIP, that on Sep 17 an outgoing correspondence regarding test invitation (I did
receive test invite), but another outgoing message on Sep17 citizenship record of decision...
probably sent out to the primary office? (may be), probably nothing to do with the oath invite.
There was nothing about the oath on the ATIP that I received on the same day that the eCAS
changed to DM, and updated with the date for oath.
So probably nothing to indicate anything positive regarding the oath date... but it should happen sooner
than you think...