使用IPP创建CUPS系统订阅失败，提示缺少属性

我尝试使用IPP协议创建CUPS的系统订阅，根据官方文档该操作可行，但始终无法成功，且未在网络上找到相关解决方案。

我已成功生成打印机订阅请求，内容如下：

VERSION 2.0
OPERATION Create-Printer-Subscriptions

GROUP operation-attributes-tag
ATTR "attributes-charset" charset: utf-8
ATTR "attributes-natural-language" naturalLanguage: en-US
ATTR "printer-uri" uri: ipp://0.0.0.0:631/printers/PDF

GROUP subscription-attributes-tag
ATTR "notify-events" keyword: printer-modified,printer-added,printer-deleted
ATTR "notify-recipient-uri" uri: http://127.0.0.1:3333

但在尝试使用Create-System-Subscriptions操作时，将printer-uri替换为system-uri后，系统提示缺少属性，对应的请求内容如下：

VERSION 2.0
OPERATION Create-System-Subscriptions

GROUP operation-attributes-tag
ATTR "attributes-charset" charset: utf-8
ATTR "attributes-natural-language" naturalLanguage: en-US
ATTR "system-uri" uri: ipp://0.0.0.0:631/

GROUP subscription-attributes-tag
ATTR "notify-events" keyword: printer-added,printer-deleted,printer-modified
ATTR "notify-recipient-uri" uri: rss://host.docker.internal:3333/

内容的提问来源于stack exchange，提问作者user26393525