From ema.arrl.org:
Updated October 28, 2020 at 10:00 AM
All Massachusetts hams with Ham Radio passenger special plates must renew their plate registration by the last day of November. Eastern MA ARRL staff are receiving reports of license plate renewal problems when attempting to use the online system. Apparently, the Registry of Motor Vehicles’ computer system doesn’t recognize the “slash” representing the “lightning bolt” icon. For example, the call sign WX1XXX is actually coded in the system as “WX1/XXX”; KX1X is “KX1/X.”
Renewal by phone DOES appear to work when you input the phone ID code listed on the application.
Another ARRL member adds, “I found that Registry services at AAA offices can overcome the issue. One must be a AAA member, and an appointment is necessary.”
This latest problem is in addition to the fact that MA RMV cannot process new Ham Radio Plate applications. See: https://nediv.arrl.org/2020/10/01/massachusetts-department-of-motor-vehicles-is-not-processing-ham-operator-plate-applications/.