Why is Grammarly not working in Word?
To exclude your worries, we come up with several workable solutions for you.
Hope them work fine!

How to Fix Grammarly Not Working in Word?
To fix Grammarly not working in Word in this method, follow the guidelines below:
Step 1.
Open your Microsoft Word and click onFileon the top-left of the main page.

ClickOptions, findGrammarlyon the right pane and press it.
ChooseCOM Add-insforManageand click onGo.
Now, you’ve got the option to see if the Grammarly plug-in is checked.

Fix 2: Check Your Document
Grammarly wont open if you just open an empty document.
If it is abnormal, attempt to create another account to log into the plug-in.
If Grammarly works fine with your new account, it means that your previous account is problematic.
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Just continue to use this new account or contact your account administrator.
If Grammarly add in for Word not working just happens on a particular document.
It is advised to disable your privacy permissions temporarily to test if this works out for you.
Fix 5: Reinstall Grammarly
Reinstall Grammarly also deserves a shot.
PressWin + Ito openWindows configs.
Scroll down to locate Apps and select it.
InApps & features, findGrammarly for Microsoft Office Suiteand hit it to chooseUninstall.
HitUninstallagain to confirm this action.
Therefore, you could try todisable Windows Defenderfor a while to see if it works out for you.
Hit thegearicon to openSettings.
ClickUpdate & Security>Windows Security>Virus & threat protection>Manage configs.