Login to https://outlook.office.com/owa/
click on gear icon and select view all outlook setting
on Email tab select compose and reply and fill in your signature Login to https://outlook.office.com/owa/
If you get error the text your types is too long, clean up the signature
Copy to new word documents and save the document as web page Filtered closed word and reopen the doc (it should open in web browser) then select the text and copy then paste in to signature are in OWA