why cant i sign in into others link of word whenever i clicked sign in

If you are saying that you can't sign in to access a document for which you have received a link, the most common explanation is that the link type assumes that you are a member of the sender's organization.

Contact the sender and ask for a download link or maybe that they resend the file as an e-mail attachment instead.

Hello,

1. Are you trying to access Word documents shared with you through OneDrive, or are you unable to sign in to your own OneDrive account?
2. Are you using a personal Microsoft account or a work or school account?
3. If this is a shared Word file, do you get an error message when you click the sign-in option?

Try opening the link in an InPrivate window:

1. To open an InPrivate window in Microsoft Edge, press Ctrl + Shift + N, then go to https://onedrive.live.com/.
2. Sign in with your Microsoft account and check whether you can access your shared Office files through OneDrive on the web.
3. If you can access the files, clear your browser’s history, cache, and cookies. Then return to the OneDrive website and try opening the files in a regular browser window.

Let me know the results.