How to fix the below Error when magento upgrade 2.2.1 to 2.4.3.
When I have run setup upgrade command then showing error.
Unable to apply data patch Magento\Tax\Setup\Patch\Data\UpdateTaxRegionId for module Magento_Tax. Original exception message: Code already exists.
Whenever a patch is run, Magento adds it into the patch_list table, so, the next time when you run setup:upgrade, it checks if that patch is present in that table, then it skips the patch. So, what you can do, is just manually add \Magento\Tax\Setup\Patch\Data\UpdateTaxRegionId into the table.
I guess this issue occurred during php bin/magento setup:upgrade
look like you already applied patch earlier and upgrade want to apply it again so, simply you can delete this file
/vendor/magento/module-tax/Setup/Patch/Data/UpdateTaxRegionId.php
or try to upgrade with latest version 2.4.3-p2 this may also fix problem
Update
If you were upgrading to Adobe Commerce (all deployment methods)/Magneto Open Source version 2.3.5, upgrade to version 2.3.5-p1. Adobe Commerce (all deployment methods)/Magento Open Source version 2.3.5-p1 replaces 2.3.5.
If you were upgrading to Adobe Commerce (all deployment methods)/Magento Open Source version 2.3.4-p1, upgrade to version 2.3.4-p2. Adobe Commerce (all deployment methods)/Magneto Open Source version 2.3.4-p2 replaces version 2.3.4-p1.
