same-security-traffic permit inter-interface and same-security-traffic permit intra-interface are not the same.

Did you spot the difference? While working on getting VPN users to pass traffic between each other I found out that those commands will conflict with each other.

same-security-traffic permit inter-interface
same-security-traffic permit intra-interface

I spotted a post that said these commands are required for vpn users to pass traffic between each other:

same-security-traffic permit intra-interface

object network AnyConnect_Users
  AnyConnect_subnet

nat (outside,outside) source static AnyConnect_Users AnyConnect_Users destination static AnyConnect_Users AnyConnect_Users

I had those commands already, but I also had same-security-traffic permit inter-interface enabled, and that was the problem.

Removing same-security-traffic permit inter-interface fixed the issue.

same-security-traffic

same-security-traffic permit inter-interface is the top checkbox.

same-security-traffic permit intra-interface is the middle checkbox.

Also, I couldn’t add the nat statement with ASDM. It would reset after a refresh. I had to use the CLI.