Email forwarding is down!
Gmail is not forwarding from one Gmail account to the other!
–from Google Support
There are some possible reasons why you encounter Gmail emails not forwarding to Outlook.
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Besides, this error may also be brought on by outage issues of Outlook or a corrupt PST file.
Are you experiencing the Gmail spell check not working issue?
Why does this error occur?

How to fix this issue?
This post gives you reasons and some fixes.
Method 1.

Open Microsoft Outlook and clickFile.
SelectManage Rules & Alert.
In the pop-upRules and Alertswindow, pick the created rules.

ClickDelete > OKto delete all the created rules.
Method 2.
Check Gmail IMAP/POP configs
Step 1.

Open Gmail on your web app and enter to your Gmail account.
Then click theMain menuicon and selectManage labels > Forwarding and POP/IMAP.
SelectEnable POP for all mailorEnable IMAP.
Method 3.
Method 4.
Go toOutlook > File > Account options > Account options.
In the promptedAccount Settingswindow, at theEmailtab, double-click your Gmail account.
Then clickNext > Done.
Method 5. you’re able to refer tothis guideto fix the corrupted PST file.
Go toFile > Tools > Mailbox Cleanup.
you’re able to try these ways one by one to solve your problem.