There's NO SUCH THING as "Sign Gifts" that's just more phony theology from the cessationist paradigm. It's true that tongues were seen as an indication that a person was being "endued with power" (Jesus' words), but that wasn't their primary purpose.
There's just GIFTS which are given to people according to need. And whether you like it or not, men ARE STILL "Moved by the Holy Spirit" in 2024. Any definition of "Sola Scriptura" that eliminates God's direct inspiration is FALSE.
The PROBLEM IS that in some cases is that a FALSE TEACHER/Prophet/Denominational paradigm, will be "Moved by a spirit" CONTRARY to what the WORD IN CONTEXT says. Joeseph Smith being a prime example. There probably WAS an "angel Moroni". But Moroni's message was satanic.
In that case, if you're Biblically knowledgible, you can easily tell that while they may have been "Moved by a spirit", it wasn't God's Holy SPirit. The demonic can "inspire us" just as well as God can. Ignorance of the Bible renders one "FAIR GAME" for deception.