hi there!
Update the MS Office to latest version.
Afterword, Remove the Entered Activation Keys and Reactivate. Enjoy!
Activation keys removing guide;
Open CMD as Admin
Enter below code as per your Office Version.
if your Office 2016 / 2019 is:
"cd C:\Program Files\Microsoft Office\Office16"
or
"C:\Program Files (x86)\Microsoft Office\Office16"
if your Office 2013 is :
"cd C:\Program Files\Microsoft Office\Office15"
or
"cd C:\Program Files (x86)\Microsoft Office\Office15"
- Now you can check the license status by running the script called ospp.vbs, which is located in your Office program folder.
"cscript ospp.vbs /dstatus"
You’ll see some license details such as the license type (a retail copy, a volume licensed copy, or Office subscriptions copy) and the last 5 characters of the product key.
- Remove Existing Office Product Key
To remove your Office product key, you need to use the /unpkeyswitch, along with the last 5 characters of the product key.
"cscript ospp.vbs /unpkey:{last five characters of product key}"