Failed to update DDNS "myQNAPcloud"

All three of my QNAP NASs (TS-231K, TS-328 and TS-453Be) started throwing this error (in the subject line) via periodic info emails beginning a few hours ago. And when I try to do a manual DDNS update within the myQNAPcloud app on any of them, I get the following response:

“Unknown error. Error code: -995.”

Anyone else, or is this just affecting me? I’d power-cycled my cable modem shortly beforehand, which presumably generated me a new WAN address, therefore kicking off DDNS update attempts.

…and right after posting my original message, I checked my email inbox, and waiting for me were Updated DDNS “myQNAPcloud” just-generated email messages from two of my NASs (with the third presumably soon to follow). Now fixed, it seems!

Hope no part of the NAS is exposed to WAN. (QNAP DDNS usage always makes me nervous)