According to today's announcement, PTABE2E will disappear October 9, 5PM, and there will be no means to efile in PTAB AIA proceedings from then until the PTO stands up "P-TACTS" a couple days later, on October 11, 11 PM.
And of course counsel that do not have My.USPTO accounts for their current PTABE2E email address will be locked out of P-TACTS, per the PTO's prior guidance.
Best regards, Rick Neifeld, Ph.D., Patent Attorney
Neifeld IP Law PLLC
9112 Shearman Street, Fairfax VA 22032-1479, United States