Steps
Log in to the second Plannit account
Go to Settings
Open the Resources section
Click the “+” button in the top-right corner, then select New Resource → Employee
Enter the same email address used in the first account
Select the required:
permissions
notification settings
Send the invitation
The user accepts the invitation (using the same password)
Result
When logging in, the user will see the second Plannit license
They can switch between accounts from the Settings menu (top right)