Magento 2.4.3 Session Size Error

After upgrading to Magento 2.4.3 you may see the above error after creating a new order or trying to add a new product in the admin panel.  After checking the logs you’ll see a message similar to:

“Session size of xxxxxx exceeded allowed session max size of 256000”

After slamming your head on the table or wall for a few minutes, hopefully you will stumble across this post and it will help. The simple fix for this is to just run the following command:

bin/magento config:set system/security/max_session_size_admin 0

Then just flush your cache:
bin/magento cache:flush

Simple as that. I hope this helps!