why don't my hyperlinks work in sent documents

The links are to the appendix within the same document and they all work fine on my pc in odt format using Libre, but when I try to send them via outlook the receiver is unable to open links.

And why do you assume this being a problem of LibreOffice, if the receiver ist not able to (correctly) open your .odt file? If you don’t provide any information, how the receiver opens the file (does he/she use LibreOffice or does he/she open the files using some other application like MS Word) nobody will be able to provide a sound answer without speculating / assuming too much.