Hi there, James.
As of now, there no available option to notify users when other accounts goes online / offline. Nevertheless, plenty of Suggestion were created to request for it as per the following list:
I encourage you to visit the suggestion pages linked above and click the Vote and Watch links near the top right to show support for the features. By doing this, it will ensure you are proactively informed of progress and updates going forward.
Feel free to share your feedback on the importance of the feature too. You can do this by leaving a comment on the ticket as this helps us prioritize & understand the use case of the feature request. Hope that helps!
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