UX Improvements for deactivated accounts that were previously managed

Issue Summary

If a user's managed account is deactivated while being managed by an Org when the domain is unclaimed the user can't reactivate it on their own.

Steps to Reproduce

1. Verify a domain
2. Deactivate an account
3. Remove the domain claim
4. Try to authenticate to the account to see the message below but then, nothing happens:

Expected Results

There should not be so much friction for these users to re-activate their accounts. The current solution is very time consuming and involves keeping track of multiple moving parts.

Actual Results

The users see the message in the image above and check their email to find 

There are no instructions on what to ask the admin or what they can do. The admin should either reclaim the domain or open a support ticket with Atlassian. This is not made clear

Workaround

If possible, reclaim the domain and activate the accounts in question.
If not, open a support ticket with us.