The IP address under AS4134 displays "This network is restricted"

[HerobrineWhite]

Hi, engineers from the TunnelBroker team.

A friend of mine created an IP tunnel years ago and has been using it ever since.
His upstream router does not support IPv6 distribution, and he has recently found that he is unable to update the "Client IPv4 Address" using the website API. When he browses or uses "cURL" to access the Update URL, he receives an abuse warning message.
I'd like to ask what happened. Is it still possible to restore the AS4134 dynamic update for "Client IPv4 Address"?