The customer can't stay logged in in multiple instances with different users if Atlassian Account is enabled and the option to add the customer as admin in both instances isn't suitable for the user.
- Allow to log into mutiple accounts on id.atlasssian.com like Google, so we can stay logged in on different instances.
- Allow different login cookies for different instances so we can stay logged in on different instances.
Sometimes, we work on multiple instances. For security reasons, we are required to use different email addresses for each instance. So, we have to keep logging in and out to work on different instances is not convenience at all.
Use an incognito window for other users.