I fix Prestashop Sendinblue Unable to sync "An error occurred during login"

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What is this problem impossible to synchronize Prestashop Sendinblue "An error occurred during the connection"?

Sendinblue cannot be synchronized with Prestahop 1.7.8.0. This message is sent to me when I want to connect from my Back Office Presta to Sendinblue. "An error occurred while connecting. Please try again. This message appears when I try to connect SendinBlue with Prestashop 1.7.8.4. "Something went wrong. Try Again. ". The entire Module > Module Manager menu is now unavailable. It's just a blank sheet. Someone know how to use FTP to uninstall Sendinblue. Same problem, but Sendinblue doesn't know how to fix it. My problem came from the module responsible for blocking cookies. So I replaced it! This is convenient, but a great idea if it works for you. If you don't have Sendinblue, disable each module individually. When we try to configure Sendinblue, the following error message appears. We have contacted our host and the problem persists despite some adjustments. You cannot send emails from this server configuration. For the following IP, please contact your system administrator to allow outgoing connections to port 587
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What is the solution to this problem cannot sync Prestashop Sendinblue "An error occurred while logging in"?

If you have installed Sendinblue for Prestashop and you are having a technical problem, Web2007 can assist you and troubleshoot. You should know that in almost all cases, the module works perfectly, the server or php error comes from a conflict with your theme or one of your other installed modules. A troubleshooting expert will first detect errors with Prestashop's debug mode. Here are the tips: To determine if the bug is due to your template, activate the default Prestashop template and then refresh the page. If the bug persists, it means that your model is not at fault. To determine if the bug is caused by one of your modules, disable each module and refresh the page that caused the problem. If the bug appears suddenly, you can start with the modules that were installed most recently. If the bug goes away when you disable a module, that means that module is responsible.
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