Hi @MichelleARC ,
There is no way to realize upgrad or convert the old Classic Pages to Modern Pages. You may need to manually create new Modern Pages.
"Page not found error", please check if the page is deleted and exists in the recycle bin.
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Hi @MichelleARC ,
Did my response answer your question? If I misunderstand something, please let me know! If there is any other assistance i can provide, please feel free to let me know, i will do our best to help you.
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