CARP Sync Problem
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The configuration versions of pfSense must be identical on both units.
It can't synchronize from 2.3.4 to 2.3.2 because they have different configuration formats
https://doc.pfsense.org/index.php/Versions_of_pfSense_and_FreeBSD
2.3.4 is revision 15.8, 2.3.2 is 15.5. Attempting to synchronize that could cause a bad configuration to be loaded on the backup unit.
Upgrade both to 2.3.5-p1 (or preferably 2.4.2-p1) and try again.
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