Hello,
I have installed Klaviyo in my Magento account successfully and have integrated, as well. Followed all the steps from this link https://help.klaviyo.com/hc/en-us/articles/115005254348.
At first, I installed it on our staging and did some tests, which then I proceed to live integration. Before I did that, I disabled staging to make sure it won’t get conflict. Then installed it on live smoothly where I can see it from here https://www.klaviyo.com/integrations.
After a few days, I just saw it on the notifications saying “Klaviyo is no longer authorized to connect to Magento 2”. The frontend is showing an error below.

Looking at the DevTools > Network Tab > Filter by “KlaviyoCustomerData”. File is showing 404 not found.
Debugging
First attempt:
Have to do a Hard clean static files
rm -rf pub/static/frontend
rm -rf pub/static/_requirejs
rm -rf var/view_preprocessed
Then deploy
bin/magento setup:static-content:deploy -f
php bin/magento cache:clean
php bin/magento cache:flush
Still showing error on the frontend
Second attempt:
- Disabled the module
- Run the command
bin/magento setup:di:compileandbin/magento setup:static-content:deploy -fand cache command - Remove Klaviyo from the composer
composer remove klaviyo/magento2-extension - Install again from the composer
composer require klaviyo/magento2-extension:4.4 - Enabled the module
bin/magento module:enable Klaviyo_Reclaim --clear-static-content - Run the command
bin/magento setup:di:compileandbin/magento setup:static-content:deploy -fand cache command - Enabled from the admin and authorise Magento to Klaviyo
- Still showing error on the frontend even in Incognito
Magento Version: 2.4.8-p3
Need advice on what needs to be done and appreciate all the help. Thanks!

