A family of Microsoft word processing software products for creating web, email, and print documents.
Dear Olusola Kolawole,
Thank you for spending time doing tests and sharing with us the result.
Since you also meet the same situation, it's an issue from the document owner side.
When you open the shared document on the web, can you download it by going to File > Save as > click "Download a Copy"? If yes, can you edit the downloaded document in Word desktop application?
May I know how did the owner share the document? Did he share it via select the document> choose Share > set permission and then click Send?
You may let him try "Copy link" to generate a sharing link and give the link to you. For the permission, you may let him try "People you specify can edit".
Thanks for your time and cooperation so far. Welcome to post back when you have any update.
We hope you are keeping safe and well!
Sincerely,
Tina | Microsoft Community Moderator