Hi,
Did this problem appear in all Websites?
I suggest you try to copy and paste the Web content to Text and confirm if the content available.
If you also cannot paste into Text, I suggest you check if the Website permission and confirm you can copy the website content.
You can also try to repair Office application:
Just checking in to see if the information was helpful. Please let us know if you would like further assistance.
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.