From the AMA Goverment Regulations Blog

As we proceed with this process, we suggest AMA members hold off on registering their model aircraft with the FAA until advised by the AMA or until February 19, the FAA’s legal deadline for registering.

Holding off on registration will allow AMA time to fully consider all possible options. On a parallel track, it also allows AMA to complete ongoing conversations with the FAA about how best to streamline the registration process for our members.

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AMA Goverment Regulations Blog

FAA Registration Page