Sub account plugin conflict

I am having an issue when it comes to your plugin and our existing plugin setup. Send User Emails is conflicting with our Sub Account plugin: https://woo.com/products/subaccounts-multi-user-accounts/ .

When Sub Accounts is active along with Send User Emails, multiple back end .php pages produce 404s.

For example when both are activated, Dashboard>Plugins results in a 404.

Any help with this would be wonderful as your plugin is exactly what we are looking for in regards to notifying our subscription customers about service interruptions.