(-15): Cannot connect to license

It can be used on the server side. On the customer service side, 7788@server will prompt to display an error " (-15): Cannot connect to license No solution was found in the knowledge base queryI am using Mathcad Prime Release 8.0 and Datecode8.0.0.0

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Translated from Simplified Chinese to English at 8:41am IST on 15-11-2022 by vnamboodheri(Google translate)
在服务端可以使用 在客服端7788@服务器 会提示显示错误“ (-15): Cannot connect to license
在知识库查询也没有找到解决办法