It might happen for two reasons:
If the system takes a while, it could be because there are too many products fetched from your Merchant account
You can confirm the status by clicking on the 'Update Status' icon
If it has been pending for more than a couple of hours, it might be because Optmyzr has lost permissions to access your feed. This happens when permissions expire for the Merchant Center email.
To solve this, you can relink your Merchant Center Email and refresh permissions by clicking on "Link it to Optmyzr" . You'll have to relink the merchant center email as if you were linking a new email to refresh permissions. You can also watch our demo video here.
Our award-winning customer care team is here for you.