Actually spent a few hours with TAC last night, bottom line, their is a work around, where they log into to root and delete the host/key folder and then you can try again to import the key through the article
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000HByDCAW
This this not work for me, and they are researching a possible workaround, if there is any.
They said it is a know issue and it is said to be fixed in 10.2.4. we are running 10.2.3 and .4 is not available for download.
It seems the key the gui is looking for is the md5 "hex key word" but what you import is actually a alaphnumberic equivelant.
ive tried all kinds of combinations but have not gotten anywhere.
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