From a notice that Social Security posted online but has not promoted:
New online service - Electronic filing of a representative's notice of appointment On February 22, we released a new service to allow representatives to initiate an SSA-1696 notice of appointment online where they and their claimants can complete, sign and submit the form electronically with no personal contact. This is a two-step process the representative must initiate. Once the claimant completes the second step and submits the signed document, the service will automatically route the document for processing. This service will help expedite the appointment process and give representatives and claimants flexibility. We will continue to accept submissions of appointment notices via mail, eFax, or uploaded through our filing portals and Electronic Records Express as before. The link to the e1696 is located at the top left of this page, so be sure to bookmark it!
And this is the link to the e1696. I haven't tried it yet but I'm told it's not working, which may be why they're not promoting it.
Update: Social Security just posted this today:
How will SSA process my notice of appointment while emergency procedures are in place?
Date:
Beginning March 11, 2021, we have revised our temporary procedures to allow you to use different methods to sign the notice of appointment of a representative and fee agreement, if the fee agreement is submitted with the new notice of appointment, during the current COVID-19 health emergency. During this time, if we receive an appointment document such as the Form SSA-1696, on its own or along with an SSA-8000, SSA-8001, SSA-L2, SSA-820, SSA-821, SSA-827, or SSA-455 form, and your signature appears to be an electronic or digital signature, we will make three attempts to contact you to verify your identity and confirm the signature. If we verify your identity and signature, we will process the appointment as usual. If the first attempt to reach you by telephone is unsuccessful, we also will send a call-in letter to you and the representative you requested. If we cannot reach you and you do not return our call, or do not verify the signature, we will return the paperwork to the person who submitted it without recognizing the appointment.
We also have temporary procedures in place permitting you to verbally appoint a representative during a “remote” telephone hearing with an administrative law judge, if you submit a written notice of appointment afterwards. In this case, we will accept an electronic signature on the written appointment notice, without needing to call you again.